Table 8. National estimates for coverage with ≥ 1 dose tetanus, diphtheria, and acellular pertussis vaccine (Tdap) among adolescents 13-17 years by 

selected characteristics, National Immunization Survey-Teen, 2016-2017

2016 2017

Single Dual Difference* Single Dual Difference*

% (95% CI) % (95% CI) Percentage Points 

(95% CI)

% (95% CI) % (95% CI) Percentage Points 

(95% CI)

Age at interview

13 87.0 

(84.3 , 89.7)

87.6 

(85.5 , 89.7)

-0.6 

(-1.3, 0.1)

85.7 

(83.0 , 88.4)

86.4 

(84.2 , 88.6)

-0.7 

(-1.3, -0.1) †

14 88.8 

(86.7 , 90.9)

88.5 

(86.4 , 90.6)

0.3 

(-0.8, 1.4)

90.1 

(88.3 , 91.9)

89.9 

(88.2 , 91.6)

0.2 

(-0.6, 1.0)

15 87.8 

(85.2 , 90.4)

87.9 

(85.7 , 90.1)

-0.1 

(-0.8, 0.6)

90.1 

(88.4 , 91.8)

89.4 

(87.7 , 91.1)

0.7 

(-0.2, 1.6)

16 88.7 

(86.5 , 90.9)

89.2 

(87.6 , 90.8)

-0.5 

(-1.1, 0.1)

89.9 

(88.1 , 91.7)

89.7 

(87.8 , 91.6)

0.2 

(-0.3, 0.7)

17 87.5 

(85.2 , 89.8)

86.8 

(84.6 , 89.0)

0.7 

(-0.5, 1.9)

87.3 

(84.2 , 90.4)

88.1 

(85.6 , 90.6)

-0.8 

(-1.3, -0.3) †

Race/ Ethnicity

White, Non-Hispanic 89.0 

(87.9 , 90.1)

89.3 

(88.4 , 90.2)

-0.3 

(-0.7, 0.1)

89.7 

(88.7 , 90.7)

89.7 

(88.8 , 90.6)

0.0 

(-0.4, 0.4)

Black, Non-Hispanic 89.5 

(87.2 , 91.8)

89.6 

(87.6 , 91.6)

-0.1 

(-0.8, 0.6)

89.8 

(87.5 , 92.1)

89.7 

(87.2 , 92.2)

0.1 

(-0.5, 0.7)

Hispanic 84.6 

(81.4 , 87.8)

85.4 

(82.8 , 88.0)

-0.8 

(-1.7, 0.1)

85.6 

(82.4 , 88.8)

86.4 

(83.8 , 89.0)

-0.8 

(-1.4, -0.2) †

Other, Non-Hispanic 87.9 

(84.5 , 91.3)

85.4 

(81.7 , 89.1)

2.5 

(0.2, 4.8) †

88.9 

(86.0 , 91.8)

87.8 

(85.1 , 90.5)

1.1 

(-0.4, 2.6)

Poverty status

Below poverty 86.7 

(84.5 , 88.9)

86.7 

(84.7 , 88.7)

0.0 

(-0.7, 0.7)

88.7 

(86.4 , 91.0)

88.2 

(85.9 , 90.5)

0.5 

(-0.2, 1.2)

At or above poverty 88.4 

(87.2 , 89.6)

88.4 

(87.4 , 89.4)

0.0 

(-0.5, 0.5)

88.6 

(87.4 , 89.8)

88.8 

(87.8 , 89.8)

-0.2 

(-0.5, 0.1)

MSA status

MSA, Principal City 88.4 

(86.7 , 90.1)

88.4 

(87.0 , 89.8)

0.0 

(-0.6, 0.6)

88.7 

(87.2 , 90.2)

88.8 

(87.4 , 90.2)

-0.1 

(-0.4, 0.2)

MSA, Outside of a Principal City 87.6 

(85.9 , 89.3)

87.8 

(86.3 , 89.3)

-0.2 

(-0.8, 0.4)

88.8 

(87.2 , 90.4)

88.9 

(87.6 , 90.2)

-0.1 

(-0.6, 0.4)

Not in a MSA 87.9 

(86.2 , 89.6)

87.7 

(86.0 , 89.4)

0.2 

(-0.7, 1.1)

87.5 

(85.0 , 90.0)

88.0 

(86.1 , 89.9)

-0.5 

(-1.5, 0.5)
2016 2017

Single Dual Difference* Single Dual Difference*

% (95% CI) % (95% CI) Percentage Points 

(95% CI)

% (95% CI) % (95% CI) Percentage Points 

(95% CI)

Insurance status

No Medicaid, private only 89.8 

(88.6 , 91.0)

89.7 

(88.6 , 90.8)

0.1 

(-0.4, 0.6)

89.3 

(87.9 , 90.7)

89.5 

(88.4 , 90.6)

-0.2 

(-0.7, 0.3)

Any Medicaid 86.5 

(84.4 , 88.6)

86.5 

(84.7 , 88.3)

0.0 

(-0.7, 0.7)

87.5 

(85.7 , 89.3)

87.8 

(86.1 , 89.5)

-0.3 

(-0.8, 0.2)

Other 86.6 

(83.3 , 89.9)

87.4 

(84.5 , 90.3)

-0.8 

(-1.7, 0.1)

89.5 

(86.3 , 92.7)

89.7 

(87.3 , 92.1)

-0.2 

(-0.9, 0.5)

Uninsured 80.5 

(74.9 , 86.1)

82.6 

(77.8 , 87.4)

-2.1 

(-3.7, -0.5) †

89.1 

(85.6 , 92.6)

86.6 

(83.0 , 90.2)

2.5 

(0.7, 4.3) †

Note: “Dual”=landline & cell-phone, “Single”=cell-phone, CI=confidence interval, MSA = Metropolitan Statistical Area

*Difference=Single%-dual%

†Denotes statistically significant difference between single- and dual-frame estimates