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Table 1 Characteristics of Children and Adolescents According to Sex in the CHNS (2015)

From: Association of body perception and dietary weight management behaviours among children and adolescents aged 6–17 years in China: cross-sectional study using CHNS (2015)

Characteristics Total (N = 1,369) Boys (N = 729) Girls (N = 640) P
BMI, kg/m2 17.86 ± 3.31 18.08 ± 3.39 17.61 ± 3.20 0.008
Age, years 10.37 ± 3.12 10.38 ± 3.18 10.37 ± 3.06 0.932
Gradea     0.491
Elementary school and below 942 (68.81) 499 (68.45) 443 (69.22)  
Junior high school 312 (22.79) 174 (23.87) 138 (21.56)  
High school and above 109 (7.96) 54 (7.41) 55 (8.59)  
Residence     0.119
Urban 465 (33.97) 234 (32.10) 231 (36.09)  
Rural 904 (66.03) 495 (67.90) 409 (63.91)  
Per capita household income     0.203
Low income 447 (32.65) 225 (30.86) 222 (34.69)  
Middle income 456 (33.31) 242 (33.20) 214 (33.44)  
High income 466 (34.04) 262 (35.94) 204 (31.87)  
Father’s education levelb     0.510
Elementary school and below 132 (9.64) 66 (9.10) 66 (10.31)  
Junior high school 433 (31.63) 241 (33.10) 192 (30.00)  
High school and above 436 (31.85) 234 (32.10) 202 (31.56)  
Mother’s education levelc     0.622
Elementary school and below 196 (14.32) 98 (13.44) 98 (15.31)  
Junior high school 466 (34.04) 251 (34.43) 215 (33.59)  
High school and above 405 (29.58) 209 (28.67) 196 (30.63)  
Physical activityd     0.126
No 830 (60.63) 427 (58.57) 403 (62.97)  
Regular 526 (38.42) 293 (40.19) 233 (36.41)  
  1. Note: The chi-square tests were used to examine significant sex difference in terms of grade, parental education level, residential area, per capita household income and physical activity. The t-test was used to examine significant sex difference in terms of age and BMI. Value is mean ± SD or N (%). Proportions are column percentages. a,b,c,d few data missing (grade 6; father’s education level 368; mother’s education level 302; physical activity 13). Bold values represent statistically significant (P < 0.05)