Table 1

Baseline characteristics of the study population stratified by BMI and WC
BMI WC
Normal weight Overweight Obese P value Normal weight Overweight Obese P value
(n= 60465) (n= 10252) (n= 7397) (n= 62946) (n= 9109) (n= 5884)
Age (years) 11.3 ± 3.1 (7,20) 11.2 ± 3.0 (7,20) 10.5 ± 2.8 (7,20) <0.001 11.2 ± 3.1 (7,20) 11.1 ± 2.9 (7,20) 11.5 ± 3.0 (7,20) <0.001
Sex
Boys 28652 (71.4%) 6568 (16.4%) 4885 (12.2%) <0.001 31414 (78.5%) 5210 (13.0%) 3407 (8.5%) <0.001
Girls 31813 (83.7%) 3684 (9.7%) 2512 (6.6%) 31532 (83.2%) 3899 (10.3%) 2477 (6.5%)
Residence
Urban 35067 (74.6%) 6865 (14.6%) 5091 (10.8%) <0.001 36525 (77.9%) 6184 (13.2%) 4168 (8.9%) <0.001
Rural 25398 (81.7%) 3387 (10.9%) 2306 (7.4%) 26421 (85.1%) 2925 (9.4%) 1716 (5.5%)
Height (cm) 147 ± 16 (106,196) 150 ± 15 (110,198) 149 ± 15 (84,196) <0.001 147 ± 16 (84,196) 150 ± 14 (85,191) 155 ± 15 (117,198) <0.001
Weight (kg) 38.8 ± 12.5 (13.9,86.7) 50.3 ± 15.3 (18.6,105.5) 57.6 ± 19.1 (17.9,139.1) <0.001 38.9 ± 12.6 (13.9,101.6) 50.7 ± 13.8 (21.0,105.4) 63.2 ± 18.5 (20.0,139.1) <0.001
BMI(kg/m2) 17.3 ± 2.3 (8.6,30.7) 21.8 ± 2.5 (11.9,27.8) 25.2 ± 3.9 (12.1,63.5) <0.001 17.5 ± 2.6 (8.6,48.9) 21.9 ± 2.7 (12.1,63.5) 25.7 ± 3.8 (8.7,47.3) <0.001
WC (cm) 60 ± 7 (26,110) 70 ± 9 (23,101) 78 ± 12 (35,131) <0.001 60 ± 7 (23,80) 72 ± 6 (58,87) 84 ± 9 (64,131) <0.001
SBP (mmHg) 102 ± 12 (62,180) 107 ± 13 (70,180) 110 ± 15 (65,180) <0.001 102 ± 12 (62,180) 107 ± 13 (65,180) 112 ± 14 (70,180) <0.001
DBP (mmHg) 65 ± 9 (40,137) 67 ± 9 (40,120) 69 ± 10 (40,110) <0.001 65 ± 9 (40,137) 67 ± 9 (40,120) 70 ± 10 (40,110) <0.001

Values are expressed as mean ± SD (Min, Max), or n(%). P value was calculated by chi-square test for category variable and one-way ANOVA for continuous variable.

BMI, body mass index; WC, waist circumference; DBP, diastolic blood pressure; SBP, systolic blood pressure.

Lu et al.

Lu et al. BMC Public Health 2013 13:24   doi:10.1186/1471-2458-13-24

Open Data