‘~o~~~mOF~~ 

~uBLICATIONSB&’ y+?. ~z:, 

EDITORIALLIB~y 

FROM VITAL & HEALTH STATISTICS OF THE NATIONAL CENTER FOR HEALTH STATISTICS 

U.S. DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE � Public Health Service I Number 32 � August 22,1978 

Sociodemographic and Health Characteristics of Persons


by Private Health Insurance Coverage and


Type of Plan: United States, 19751


During 1975 the Health Interview Survey 

(HIS) questionnaire included a supplement on 

health insurance coverage, with special emphasis 

on whether persons covered by private plans 

were members of prepaid group practice plans 

(hereafter “prepaid group”). Members of prepaid group pkms were defined as including both 

those who belonged to pk.ns classified as health 

maintenance organizations (HMO) and those 

who belonged to other prepaid group practice 

plans. 

A facsimiIe of the questionnaire used in this 

survey may be found in Series 10, Number 

115, of Vital and Health Statktics.2 The estimates produced from these data refer to the civilian noninstitutionalized population of the 

United States. All estimates presented in this report are shown by private insurance coverage 

status (covered, not covered, and unknown 

whether covered), and among those covered, by 

whether they are covered only by a prepaid 

group plan, a fee-for-service plan, or by a combination of the two. The descriptive terms refer 

to the method of reimbursement to the doctor. 

Thus fee-for-service plans incIude the Blue-type 

plans and indernnity plans in which the doctor 

receives onIy a payment specific to the service 

performed. Data presented here do not include 

Medicare coverage or use of or eligibility for 

1This report was prepared by Jai Choi and Peter Ries, 

Division of HealthInterviewStatistics. 

2National Center for Health Statistics: Current estimates from the Health Interview Survey, United States, 

1975. Vital and Health. Statistics. Series 1O-NO. 115. 

DHEW Pub. No. (HRA) 77-1543. Health Resources 

Administration. Washington. U.S. Government Printing 

Office, Mar. 1977. 

Medicaid benefits. Also excluded are the 

following types of plans: those Iimited to dread 

diseases, to income maintenance, and to accidents; veterans’ benefits and medical care of military dependents; and those covering dental care 

only. 

Health Insurance Coverage Status by 

Selected Sociodemographic Characteristics 

Figure 1 and table 1 show the total civilian 

non ins t it ut ionalized population by private 

health insurance coverage status. As may be 

Figure 1. PERCENT OF PERSONS BY PRIVATE HEALTH lNSURANCE COVERAGE STATUS: UNITED STATES, 1975 

100


90 

80 [ 

Fee.for-m”ce Prepaid group Unknown if 

plant plan Not covered covered 

PRIVATE HEALTH INSURANCE COVERAGE STATUS 

1Exchdemhc1,910,CQOPms rnthfce.fmsemia pl.m who ah k!ong to prepaid group plans. 
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� 

2


Table 1. Number of persona by private health insurance coverage status and selected cbsracteristica:


United Statea, 1975
 [Data are based on household interviews of the civilian noninstit.tionakd population. The wnvcy design, general qualifications, and information on tbe Aiability of the estimates arc 

show in the Technical Notes] 

I 

Coverage status


Prepaid plan


All


Selected characters tic persons All Prepaid Fee-for- Not Un~Own
 .-
 types of supple- service :ovei%d
 coverage All Prepaid mented onlyl covered
 prepaid only by
 fee-fOr­
 service


Number in thousands


All persona----------------------- 209,065 158,085 6,532 4.622 1,910 151,552 47,433 3,547
 - - -

Age


—


O-64 years------------------------------ 1::,;:; 144,795 6,124 4,351 1,;;; 138,671 39,792 3,190


Under 17 years------------------------ 45,090 2,010 1,457 43,079 15,647 1,208


17-44 years--------------------------- 82;738 64,224 2,664 1,;;; 735 61,561 17,155 1,:;;


45-64 yeara--------------------------- :;,::$ 35,481 1,451 486 34,031 6,989


65 years and over----------------------- > 13,290 408 271 137 12,882 7,641 357


Male------------------------------------ 100,865 77,231 3,234 2,311 923 73,997 21,925 1,709


Female---------------------------------- 108,199 80,853 3,298 2,311 987 77,555 25,508 1,838


Race 

White 181,874 1;:,:;; ;,;i; 3,;;; 1,539 137,71e 36,058 2,;::


Black----------------------------------- 24,396 354 12,078 10,557


Other 2,795 1;932 ‘175 158 *17 1,756 817 46 �
 Place of residence


SM8A 143,654 111,111 5,948 4,181 ?.,767 105,163 30,015 2,529 

Central city-------------------------- 61,562 43,646 2,930 2,068 861 40,717 ~:~::: 1,205 

Outside central city------------------ 82,093 67,464 3,:;: 2,113 905 64,446 1,324 

Farm---------------------------------- 6,710 4,773 42 35 *6 4,731 1,814 124 � 

Geographic region 

Northeast------------------------------- 49,086 38,790 2,+:; 900 1,247 36,642 9,442 854 

North Central--------------------------- 55,892 46,148 641 122 45,385 9,030 714 

South----------------------------------- 66,854 46,650 359 284 46,291 18,880 1,;:: 

West------------------------------------ 37,233 26,497 3,263 2,796 4;?5 23,234 10,081 

Outside SMSA---------------------------- 65,410 46,974 441 144 46,385 17;418 1,018


Nonfarm------------------------------- 58,700 42,201 543 405 1.37 41,655 15,604 895


Education of head of fsmily2


Elementary school (O-8
 years)--------------------------------- 41,977 24,000 647 497 150 23,352 17,156 821


High school (9-11 years)---------------- 34,544 23,443 881 592 289 22,562 10,589 512


High school grad~te (12 years)--------- 68,238 55,126 2,021 1,431 590 53,105 12,091 1,021


College (13-15 years)------------------- 28,612 23,827 1,241 889 352 22,585 4,339 446


College graduate (16 years or over)----- 32,807 30,015 1,675 ,178 497 28,34[ 2,370 422


Family incomez


Under $3,000---------------------------- 14,676 5,351 171 *27 5,18C 9,014 311 

$3,000-$4,999 17,074 7,530 241 % 7,28S 9,197 348 

$5,000-$9,999 45,273 30>561 962 757 2;$ 29,60( 14,014 698 

$10,000-$14,999 47,103 40,470 1,689 ,276 413 38,78C 5,96C 674 

$15,000-$24,999 48,872 44,290 2,211 ,419 792 42,08[ 4,015 567 

$25,000 and over------------------------ 20,996 19,395 978 594 384 18,41; 1,382 219 

lExcludea the 1,910,000 persons with fee-for-service plana who also belong to prepaid plana.
 ‘Excludes unknown status.


noted, ordy 3.1 percent of the population (6.5 health insurance coverage of the types included 

million persons) were reported to beIong to was reported for 22.7 percent of the population � prepaid group plans. About 72.5 percent of the (47.4 miIlion persons). No data on coverage � 

population (151.6 million persons) were covered status were obtained for 1.7 percent of the popby fee-for-service type plans only. No private ulation. 
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admcdaa3 

‘fable2. Percent of persons by private health insurance coverage atstus and selected chsracteristica: 

United States, 1975 

pat.ambased onhousehold interviews oftheckilian noninsiitutionalizcd population..~e surwydesign, gcn.ral q.alifkntions, andinformation onthereliability
 of tbe cstinatcs are

show in the Technical Notes] 

Coverage status


Prepaid plan
 I

All 

types of coverage supple- All Prepsid mented service 

onlyz covered if covered prepaid only by fee-fOr- service 

II I 

Percent of persons 

All persons----------------------- 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 

Selected characteristic persons All Prepaid Fee-for- Not unknown


Age
 —


O-64 years------------------------------ 89.8 91.6 93.8 94.1 92.9 91.5 S3.9 89.9 

Under 17 years------------------------ 29.6 28.5 30.8 31.5 29.0 28.4 33.0 34.1 17-44 years--------------------------- 39.6 40.6 40.8 41.7 38.5 40.6 36.2 38.3 45-64 years--------------------------- 20.6 22.4 22.2 20.9 2:.: 22.5 14.7 17.6 65 years and over----------------------- 10.2 8.4 6.2 5.9 8.5 16.1 10.1 

*


Male 48.2 48.9 49.5 50.0 48.3 48.8 46.2 48.2
 Female---------------------------------- 51.8 51.1 50.5 50.0 51.7 51.2 53.8 51.8


~e 

White 87.0 90.5 81.3 81.6 80.6 90.9 76.0 78.6 Black----------------------------------- 1}.; 8.3 1;.; 15.0 18.5 8.0 22.3 20.1 Other----------------------------------- . 1.2 3.4 *0.9 1.2 1.7 1.3 

Place of residence 

SMSA------------------------------------ 68.7 70.3 91.1 90.5 92.5 69.4 63.3 71.3 Central city-------------------------- 29.4 27.6 44.9 44.7 45.1 26.9 35.2 ;;.: Outside central city------------------ 39.3 42.7 46.2 45.7 4;.; 42.5 28.1 Outside SMSA---------------------------- 31.3 29.7 8.9 30.6 36.7 28:7 Nonfarm------------------------------- 28.1 26.7 ::: 7:2 27.5 32.9 25.2 Farm---------------------------------- 3.2 3.0 ::?! 0.8 *0.3 3.1 3.8 3.5 

Geographic region


Northeast------------------------------- 23.5 24.5 32.9 19.5 65.3 24.2 19.9 24.1 

North Central--------------------------- 26.7 29.2 11.7 13.9 29.9 19.0 20.1 South----------------------------------- 32.0 29.5 ;:: 30.5 39.8 ;;.; West 17.8 16.8 5::; 6;:; 24.4 15.3 21.3 . 

Education of head of family2


Elementary school (O-8


years)--------------------------------- 20.1 15.2 10.8 15.4 36.2 23.1 High school (9-11 years)---------------- 16.5 14.8 1::! 12.8 J:? 14.9 22.3 14.4 High school graduate (12 years)--------- 32.6 34.9 30.9 31.0 30.9 35.0 25.5 28.8 College (13-15 years)------------------- 13.7 15.1 19.0 19.2 18.4 14.9 12.6 College graduate (16 years or over)----- 15.7 19.0 25.6 25.5 26.0 18.7 R 11.9 

Familv income2 

Under $3,000---------------------------- 7.0 2.6 3.1 *1.4 3.4 19.0 S.8 $3,000-$4,999--------------------------- ::: 19.4 

$5,00f3-$9,999--------------------------- 2::; 19.3 1::; 12:: 1;:+ 1;:: 29.5 1;:; $10,000-$14,999 22.5 25.6 25.9 27.6 21.6 25.6 12.6 19.0 $15,000-$24,999 23.4 28.0 33.8 30.7 41.5 27.8 16.0 $25,000 and over------------------------ 10.0 12.3 L5.o 12.9 20.1 12.2 !?:; 6.2 

lExcludea the 1,910,000 persons with fee-for-service plans who also belong to prepaid plans.


2Sxcludes unkmwn status.


� Table 2 shows selected characteristics of per- ordy. This report will emphasize the characsons by health insurance coverage status. Series tenstics of those covered by the two major al10, Numbers 66 and 117, present this type of ternative types of private health insurance. 

data in terms of heihh insurance coverage status Focusing on those in prepaid group plans 
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4 

Table 3. Number and percent distribution of persons by pri­
 vate health insurance coverage and selected characteris­
 tics: United States, 1975


[Data are based onhousehold intc, cwsofthecivilian nminstkuticmalixd poptdation. 

‘l%. surrey design, &nc,d@ cation, andrnfornu+tion on thercli~ility
 ofdm

estimates are showm in theTed icalNotes]


Coverage status


Selected Prepaid plan Fee-for-servicei
 characters tic


Number Number
 in Percent in ?ercent


thou- distri- thou- listri­


sands bution sands >ution


All persons


~ 

white


Black


Place of residence


8MSA:
 Central city
 Outside central city-


Outside SM8A-----------


Geographic region


Northeast


North Central
 South


West


Education of head of
 famil++


Less than high school-­
 High school
 More than high school-­


Family income3


~~;~%J$R::;;


6,532 100.0 151,552 100.0 

5,310 81.3 137,718 90.9 

1,047 16.0 12,078 8.0 

2,930 44.9 40,717 26.9 3>018 46.2 64,446 :$: 585 9.0 46,390 

2,14S 32.9 36,642 24.2 763 11.7 45,385 29.9 359 46,291 30.5 3>263 5;:; 23,234 15.3 

1,52S 23.4 45,915 30.3 

2,021 30.9 53,105 35.0 

2,916 44.6 50,925 33.6 

1,374 21.0 42,069 27.8 

1,689 25.9 38,7S0 25.6 

3,1s9 48.8 60,497 39.9 

lExcludesthe 1,910,000 persons with fee-for-service
 plans who also belong to prepaid plans.


‘Excludes persons of other races.
 32xcludesunknown status.


(including those whose prepaid plans are supplemented with fee-for-service type plans) and 

those in fee-for-service type plans only, it may 

be noted that varying levels of differences and 

similarities are associated with each of the sociodemographic variables (table 3). Thus the 

patterns of membership are similar by age and 

sex (table 2). However, there are wide variations 

in terms of race, place of residence, geographic 

region, education of head of family, and 

family income. Data show that the prepaid 

group membership is proportionately higher 

among blacks, within central cities, in the Northeast and especially in tie West Region of the 

country, among families where the heads have 

higher levels of education, and among families 

with higher incomes. 

Health-Related Characteristics by 

Health Insurance Coverage Status 

Table 4 shows the numbers and rates for 

several selected health-related characteristics by 

health insurance coverage status. The rates 

shown are crude rates which have not been 

adjusted to take into account any of the sociodemographic differences among the various 

coverage-status groups described in the previous 

section. Since any difference; or similarities in 

rates among the coverage-status groups may 

merely be a reflection of sociodemographic 

differences among the group’s members, it 

would not be legitimate, based on these data 

alone, to attribute the differences or similarities 

in the rates solely to the type of insurance 

coverage. 

Given this limitation, the rates may be 

compared in a purely descriptive manner, 

wit ho u t any implied inferences regarding 

causation. As may be noted, the percent of persons with limitation of activity due to chronic 

conditions is similar in prepajd group and feefor-service plans (12.2 percent and 12.0 percent, respectively); the rates for restrictedactivity and bed-disability days, doctor visits, 

and hospital discharges associated with surgical 

treatment are higher for those in prepaid group 

plans. Among persons in prepaid group plans, 

the rates are lower for short-stay hospital discharges per 100 persons and days per short-stay 

hospital discharge. 

Ambulatory Care and Hospitalizations by 

Type of Health Insurance Coverage 

A great deal of interest has centered on 

whether participation in prepaid group plans 

would tend to lead to a greater use of ambulatory care services and to a reduced use of hospit al services. This reduced use might be 

reflected in a lower rate of hospitalization 

and/or shorter periods of stay in the hospital. 

The crude rates for those covered by the two 

types of plans suggest this pattern of proportionately more doctor visits and less hospitalizations for those covered by prepaid group 

plans. However, these differences may merely 

reflect the differing sociodemographic composition of the population covered by these two 

types of plans. Comparing the specific rates for 

the various sociodemographic categories serves 
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Table 4. ~tier andrate of persons by private health insurance coverage status md selected health characteristics: 

United States, 1975 � [D.t.are b=d on-household intcrvi%s of the civilim noninstit.tiona&d popuktion. fie surveydesign, gcn~ qualiticatims, and information on tie reliab~ty o~tic cst&-tcs are 

sh;m-”~the Tahnkal NOtCS] 

Coverage status


~-

Selected health characteristic All 

persons All ~Fee-fOr- .... 11-wn types of 1 II I stile- 1service I -.!!”:-. M 

coverage I All II Prepaid I me;ted I only’ 1 coverea 1, I 

covered 

prepaid only by

I I fee- fOrservice I I L 

lJ&er in thousands 

All persons 209,065 151,552 47,433 3,547 

Personswith Mnitation of F 

activity------------------------- 29,900 18,978 795 579 18,183 10,464 458 

Restricted-activity dsys---------- 3,733,892 3,444,928 1;:, ;;; 90,098 343% z,;~,;g L,;;;, :): 57,886 

Bed-disability &ys--------------- 1,371,418 885,323 , 27,855 13,160 , > 21,260 

Short-stay hospital days for dischsrges2---------------------- 235,607 M:, ::: I 4,852 3.5;,;;$ 71,815 2,;;; 

Short-stay hospital discharges2--- 29,474 , 733 s 7,641 

Short-stay hospital discharges with surgical operationz--------- 16,071 12,176 I 38,248 I 26,531 11,717 755,737 245,673 16,436 

492 354 138 11,684 3,706 189 

Doctor visitsz 1,056,094 793,985 

Rate


� Percent of persons with Iimitatioz of activity---------------------- 14.3 12.0 12.2 12.5 11.3 12.0 22.1 12.9 

Restricted-activity days per person per year------------------ 17.9 15.5 19.0 19.5 17.8 15.3 26.0 16.3 

Bed-disability days per person per year------------------------- 6.6 5.6 6.3 6.0 6.9 5.6 9.8. 6.0 

Short-stay hospital &ys per dis&arge2----------------------- 8.0 7.5 6.6 6.5 6.9 7.5 9.4 7.6 

Short-stay hospital discharges per 100 personsz--------------------- 14.1 13.6 11.2 11.8 9.7 13.7 16.1 11.1 � Percent of discharges surgically treated2------------------------- 54.5 56.8 67.1 64.7 74.2 56.4 48.5 47.8 Dector visits per person per
 yearz---------------------------- 5.1 -L5.0 5.9 5.7 6.1 5.0 5.2 4.6

lExcludes the 1,910,000persons with fee-for-service plans whoalso belong to prepaid plans. 

2Wuiownif subscribers of a plan Usedthe facility of that plan. 

. 

. 

to minimize the confounding irri-luence of the Among families at the intermediate level of 

differences in the composition of the two popu- income and education, the average length of stay 

lations. per discharge for those in prepaid group plans is 

Table 5 shows the specific rates for doctor as great as or greater than that for those in feevisits, and table 6 shows the specific rates for for-service plans. 

length of stay per hospital discharge. For doctor A report containing a more extensive and 

visits, the specific rates almost invariably show a detailed presentation of these data is in preparapattern of greater use by those in prepaid group tion. Copies of tabulations to be used in the 

pkms. Regarding the average length of stay per forthcoming report are available upon request. 

discharge from a short-stay hospital, the specific To receive these copies, contact the Division of 

o rates tend to be lower for those in prepaid group Hea.Ith Interview Statistics, {National Center for 

plans. However, this relationship does not hold Health Statistics. 

for all of the subgroupings shown in table 6. 
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6


Table 5. N~ber of doctor visitsi per psrson per yesr by private health insurance coverage ststus and selected
 characteristics: United Ststes, 1975 m
 [Data
am bard cm bowsbcdd intsrview of the civilim .oninstitutiomlizcd population, ‘flM survey design, geneml qualification. and information on the reliability of the e.imates are 

sko& inthe Technical Notes]


Coverage status


Prepaid planl


Selected characteristic All


>ersons All Prepsid Fee-for- Not Unknown
 types of supple- service covered if
 coversge All Prepsid mented 0nly2 covered
 prepaid only by
 fee-fOr­
 service


Number of doctor visits per person


All persons----------------------- 5.1 5.0 5.9 5.7 6.1 5.0 5.2 4.6


4s 

Under 17 y~rs -------------------------- 4.2 4.2 4.7 4.4 5.4 4.2 4.3 17-64 yeare----------------------------- 5.2 5.1 6.1 5.1 5.4 65 years and over----------------------- 6.6 6.9 9.1 ::: 1;:: 6.9 6.1 

sat — 

Nsle. . . . . . . . . . . . . . . . . --...-..---..----.- 4.3. 4.3 5.1 4.8 5.6 4.3 4.2 4.0 Female---------------------------------- 5.7 5.7 6.6 6.6 6.7 5.6 6.0 5.2


Race


White----------------------------------.
 5.1 6.0 6.0 5.2
 All other------------------------------- ::: 4.4 5.3 t:; 6.7 :;; 5.1


Place of residence


All ms’s 5.3 5.2 5.9 5.8 6.2 5.2 5.6 5.0
 Outside SNSA:
 Nmfarm ------------------------------- 4.6 4.6 5.0 5.0 *5.1 4.6 4.6 4.1
 Fsrrn . 3.8 3.9 *3.1 *3.7 *- 3.9 3.7 *1.1


Geographic region n


Northeast 5.2 5..4 4.1 6.2 4.9 North Central--------------------------- South----------------------------------- ::; 

4.6. 4.7 

4.7 5.2 5.1 *5.8 

*9.7 ::: 

4.7 ::;’ 

4.4 ::: West--------------- 5.9 5.9 i:: ::$ 5.9 5.9 6.1 3.5 

Education of hesd of f~ily � 

Elementary school (0.8 

yeare)--------------------------------- 6.9 6.5 8.3 4.7 4.3
 High school (9-11 years)---------------- ::; ::; i 6.1 5.0 ::: 5.2
 High school graduste (12 years)--------- 4.9 4.9 5.0 ;:: ::; 5.1 5.0
 College (13-15 years)------------------- 6.1 ::: 5.9 5.4
 College graduste (16 years and over)---- ;:: ::: 6.0 6.0 6.0 5.5 !:: ;:;


Fami1y incnme


Under $3,000---------------------------- 6.7 9.9 11.1 ~+.8 6.6 6.3 4.2
 $3,000-$4,999 ::: 8.3 5.4
 $5,000-$9,999 5.2 ::; ?? 7.9 ::; i:!


$10,000-$14,999 4.8 ::: ::; 5.5
 $15,000-$24,999 ::: 4.9 ::; 4.7 2:! 4.9 ::; 5.0 $25,000 and over------------------------ 4.9 5.0 6.0 5.6 6.5 5.0I 3.6 *3.1 - 1 

Msy include utilization not covered by prepaid plsn.
 2Excludes the 1,910,000 pereons with fee-for-service plam who also belong to prepaid plans.


SYMBOLS 

Datanotavtilahle----—-..--.-----.......—-­
 -..


Categorynotapplicable--------–-—-----------—
 ...


Quantityzero---------–----.--.--.----–-..—
 .


Qusntitymore thsnO butlessthsn0.05-— 0.0


Figuredoesnot meet standards
of


reliability orprecision
(more thsn


30 percentrelative
 stsndsrderror)— *


“-) 
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7 

Table 6. Number of short-stay hospital days 1 per discharge by private health insurance coverage status and selected€

characteristics: United States, 1975€ n€ [Data arebased on household interview€ of tbe civilian ncmimtit.tionalimd population. l%. survey design, s.mral q.alificatiom, and information on the reliability of the estimates arc 

shown in the TechnicalNoms]€

11 

II Coveragestatue 

Prepaid planl€

All€ Selected characteristic persons All Prepaid Fee -for- Not€ types of supple- service covere’ if€

coverage All Prepaid ment ed onlyz ,“ covered€

II prepaid only by 

fee-fOrservice I Number of hospital days per diecharge€

All persona 8.0 7.5 6.6 6.5 & 9 7.5 9.4 7.6€

Age

— 

Under 17 years 5.5 4.8 *5.O *4.4 *8.4 4.8 *3.2 

17-64 years 7.4 6.1 6.0 *6.2 7.2 ;:: 6.7 

65 years and over 12.0 11:: *11.7 *12 .2 *1O.9 11.4 3.1 *15.8 

Male 8.9 8.0 6.2 6.0 *7.5 8.1 1.4 8.2€

Female 7.4 7.2 6.8 6.8 6.8 7.2 8.0 7.2€

White 7.9 7.0 6.8 7.5 7.4 9.4 7.9 

Black 

Other 

9.2 

5.4 

;:$ 

*4.2 

*5.5 

*3.5 

*5.9 

*3.5 

*4.4 *. 9.2 

*4.4 

9.6 

*7,4 

*6.7 *. 

Place of residence 

SIKH 8.2 6.5 6.4 *6.9 9.6 7.7 

Central city 8.9 ;:: *7.4 ::; 9.6 

Outside central city 7.7 7.2 ::; ;:: *6.3 7.3 9.7 i:; 

Outside SMSA 7.6 *7.3 *7.6 *7.O 7.0 9.0 *7.O 

Non farm 7.6 ;:: *7.3 *7.6 *7.O *7.2 

Farm 6.9 6.7 *. *- *- ::; ::; *2.3 

Geographic region 

Northeast 9.7 9.1 8.0 *9.9 *6.3 9.1 

North Central 8.1 7.7 *7.O *.8 *8.2 7.7 

South *8.8 *8.2 *11.8 7.0 

Weat ;:: ::: 5.5 5.2 *7.1 6.1 

Education of head of faily€

Elementary school (O-8 

yeara)--------------------------------- 9.8 9.1 *5.7 *5.6 *6.1 9.2 10.8 *8.3 

High school (9-11 years )---------------- 8.2 *7.2 *7.9 *3.8 7.9 8.7 *6.5 

High school graduate (12 years) 7.1 ::: 7.8 *9.1 6.8 8.2 *7.1 

College (13-15 years )------------------- *7.3 4:: *8.7 7.0 8.6 *1O.9 

College graduate (16 years and over) ::; 2:: *5.1 *5.1 *5.1 6.9 7.5 *4.7 

Family income 

Under $3,000 10.3 11.5 *6.6 *6.6 *8.O 11.8 *13.9 

$3,000 -$4,999 10.3 10.2 *8.8 *8.7 *12.3 10.3 *lO.O 

8.0 8.6 *9.4 *5.O 7.8 *8.O 

gg:;~gj;:::’::::’::::’::::::’:::: .---------------------.-- ::: 

;:: 

6.3 

5.5 

6.4 

*4.3 

*6.6 

*8.2 

*5.9 

6.6 

6.2 

*6.7 

*5.9 

$25,000 and over 7.4 7.3 *5.9 *5.1 *6.9 7.3 *3.1 

‘May include utilization not covered by prepaid plans.€

%xcludea the 1,910,000 pereons with fee-for- service plsna who also belong to prepaid plana.€

TECHNICAL NOTES 

- The data presented in this report were . sample of the civilian noninstitutionalized popuobtained from- household interviews in the latick of the United States. During that year 

Health Interview Survey. These interviews were approximately 116,000 persons living in about 

conducted throughout 1975 in a probability 40,000 households were included in the sample. 

. . 
. 

8 dmcedaa -“ o 

The health maintenance organization questions 

were asked of each household member. 

Because the estimates shown are based on a 

sample of the population rather than on the 

entire population, they are subject to sampling 

error. Standard errors appropriate for the estimates of the number of persons are shown in 

table I; standard errors appropriate for percentages are shown in table II. 

Table 1. Standard errors of estimates of aggregates 

Standard Size of estimate error in in thousands thousands 

35 .......................................................................... 11 

70 .......................................................................... 15 

loo ........................................................................ 18 

3oo ........................................................................ 31 

5oo ........................................................................ 40 

7oo ........................................................................ 48 

l.ooo ..................................................................... .57 

5.000 ..................................................................... 125 

lo.ooo ................................................................... 174 

20.000 ................................................................... 237 

30.000 ................................................................... 278 

Recent Issues of Advance Data 

No. 31.	 Office Visits to Ophthalmologists: National 

Ambulatory Medical Care Survey, United 

States, 1976 (Issued: July 14, 1978) 

No. 30.1976 Summary: National Ambulatory Medical 

Care Survey, United States (Issued: July 13, 

1978) 

No. 29.	 A Comparison of Nursing Home Residents and 

Dkcharges from the 1977 National Nursing 

Table 11. Standard errors, expressed in percentage points, of 

estimated percentages 

50 ‘ -’ 

~’ 

70 ........... ................. 3.0 4.7 6.5 8.6 10.8 

100 ......................... . 2.5 3.9 5.4 7.2 9.0 

300 .......................... 1.5 2.3 3.1 4.2 5.2 

500 .......................... 1.1 1.8 2.4 3.2 4.0 

700 ........ .................. 1.0 1.5 2.0 2.7 3.4 

1,000 ..................... .. 0.8 1.2 1.7 2.3 2.9 

5,000 ..... .................. 0.4 0.6 0.8 1.0 1.3 

10,000 ..................... 0.3 0.4 0.5 0.7 0.9 

20,000 ..................... 0.2 0.3 0.4 0.5 0.6 

30,000 .... .. ........ ....... 0.1 0.2 0.3 0.4 0.5 

— 

For a more detailed discussion of the limitations and qualifications of data collected in 

the Health Interview Survey and for the size of 

sampling errors of the estimates on disability 

days, physician visits, and other rates, see Series 

10, No. 100, of Vital and Health Statistics. 

From Vital and Health Statistics 

Home Survey: United States (Issued: May 17, 

1978) 

No. 28.	 Office Visits for Hypertension: National Ambulatory MecHcal Care Suwey, United States, 

~~;9~8j975-Decerhber 1976 (Issued: April 

9 

No. 27.	 Health Characteristics of Minority Groups, 

United States, 1976 (Issued: April 14, 1978) 

A complete list of Advance Data From Vital and Health Statktics is available from the Scientific and Technical 

Information Branch. 

NCHS 

U.S. DEPARTMENTOF HEALTH, EDUCATION, AND WELFARE POSTAGE AND FEES PAID 

Public Health Service U.S. DEPARTMENT OF H.E.W. *- _ National Center for Health Statistics 

3700 East-WestHighway 

Hyattsville, Maryland 207a2 HEW 396 Q 

U.!S.MAIL 

OFFICIAL BUSINESS FIRST CLASS MAIL PENALTY FOR PRI.VATE USE, S300 

DHEW Publication No. 

(PHS) 7a.1250 

— 

To xceive this publication m!ularlv. contact 

the National Ckr for Hcakh S&istics by ICaIlingslu-osiwlss. I