[Epidemic characteristics of central obesity among adults in Gansu Province in 2013-2014].

OBJECTIVE To analyze waist circumference level and the prevalence of central obesity among adults aged 18 years and above in Gansu Province. METHODS The data from Chinese adult chronic diseases and their risk factors monitoring in 2013 was obtained by multi-stage stratified cluster random sampling method. The waist circumference level and epidemiologic characteristics of central obesity of 7607 adults aged 18 years and above in Gansu Province were analyzed. RESULTS The waist circumference was(84.7±10.3)cm and(81.3±9.5)cm for adult men and women in Gansu Province, respectively. With the increase of age, waist circumference level of women showed a gradual increase trend from 78.6 cm in the group of 18-44 years to 83.5 cm in the group above 60 years; with improvement of education level, the average waist circumference of men gradually increased from 82.7 cm in illiterate/semi-literate group to 87.6 cm in group of junior college and above(P<0.001), but the value of women gradually reduced from 81.9 cm in illiterate/semi-literate group to 77.6 cm in group of junior college and above group(P<0.001); the higher the average annual income of family, the higher the waist circumference of the men from 83.0 cm in the group below 5000 yuan to 85.9 cm in the group above 18 000 yuan; among the occupational group, the highest waist circumference(88.9 cm) was the men engaged in enterprises and institutions and in contrast the women were the lowest in this occupation(79.0 cm). The prevalence of central obesity was 32.6%(standardized rate 28.8%) and men(33.9%)(standardized rate 28.8%) was higher than women(30.9%)(standardize rate 28.8%). The pre-obesity rate was 18.1%(standardized rate 17.6%), and that of women and men was 19.5%(standardized rate 18.5%) and 16.2%(standardized rate 16.0%), respectively. With the age increase, the central obesity rate of women showed a gradually increasing trend from 22.6% in the group of 18-44 years to 45.3% in the group above 60 years. With the increase of education level, the prevalence of central obesity showed increasing trend from 23.0% in illiterate/semi-literate group to 42.5% in group of college and above in men(P<0.001), but the prevalence of women gradually reduced from 36.1% in illiterate/semi-literate group to 20.1% in group of college and above group(P<0.001); with the increase in per capita annual income of the family, the prevalence of male central obesity increased from 23.8% in the group below 5000 yuan to 35.5% in the group above 18 000 yuan; among the professional groups, men predisposed central obesity(48.5%, P<0.001) and women had lowest prevalence(25.8%, P<0.001) in enterprises and institutions. Among the groups of overweight and obesity, the waist circumference was(88.3±7.4) cm and(98.8±8.3) cm in men, respectively, while the waist was(84.4±6.7)cm and(94.5±8.1)cm in women, respectively; the prevalence of central obesity was 43.3% and 87.7% in men and 47.3% and 93.9% in women between overweight and obese groups. However, the rate of central obesity in the groups without overweight/obesity(BMI<24.0) was only 6.0% in men and 9.8% in women. CONCLUSION The central obesity is widely prevalence in adults of Gansu Province, and the averaged waist circumference level in men and women is close to or more than the cut-off point predicating pre-central obesity and the prevalence for this type of obesity is higher than that of the national level which indicates that using cut-off point of waist circumference. The subjects with obesity are more likely susceptible to central obesity.