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Table 1 The school characteristics (n = 30)

From: School environment factors were associated with BMI among adolescents in Xi'an City, China

School name Enrolment Age (SD) %Female Parental BMI Parental education (years) Household wealth * %Overweight/obesity **
Xincheng District
29th 258 13.8 (1.0) 54.1 22.1 9.4 -1.0 11.5
89th 3752 13.7 (1.0) 50.0 22.1 11.2 0.7 21.7
Aizhi 3095 13.7 (1.0) 51.7 22.9 13.5 1.9 16.7
Huanghe 2125 13.6 (1.0) 48.3 22.6 12.2 1.2 18.3
Xiguang 1857 13.7 (1.0) 49.2 22.7 13.1 1.0 15.3
Dahua 987 13.9 (0.9) 46.7 22.5 10.3 -0.7 10.0
Total 12074 13.7 (1.0) 50.0 22.5 11.6 0.5 15.6
Beilin District
8th 2277 13.6 (1.0) 45.8 22.7 12.1 1.3 28.8
82th 820 14.6 (1.0) 52.5 23.2 10.9 0.3 11.5
Zunde 534 13.6 (1.0) 45.0 23.1 11.3 0.6 20.0
Jiankeda 663 14.2 (0.9) 50.9 22.7 13.4 1.3 15.3
Shenjian 593 14.6 (1.0) 47.3 23.1 10.9 0.0 12.7
Total 4887 14.1 (1.1) 48.3 23.0 11.7 0.7 17.7
Lianhu District
15th 746 14.3 (1.1) 48.3 22.3 10.3 -1.1 11.7
67th 1040 14.2 (1.0) 48.3 22.1 9.5 -0.8 18.3
Dianli 1802 13.5 (1.0) 49.2 22.5 11.5 0.5 21.3
YD1st 2583 13.6 (1.0) 51.7 23.2 12.4 1.0 18.3
YD2nd 3744 13.8 (0.9) 61.7 22.6 10.8 0.3 20.0
Total 9915 13.9 (1.0) 51.8 22.6 10.9 0.01 17.9
Yanta District
46th 282 14.2 (1.1) 48.3 23.2 8.7 -1.5 15.0
98th 1323 13.9 (1.0) 50.0 23.1 11.8 0.3 15.0
Gaoxin 2957 13.7 (1.0) 50.0 23.3 13.7 2.2 53.3
Dianzi 1206 13.8 (1.1) 40.0 22.7 10.8 0.0 21.7
Shida 1506 13.6 (1.0) 46.7 23.1 14.4 1.8 23.3
Total 7274 13.8 (1.0) 47.0 23.1 11.8 0.5 25.7
Weiyang District
16th 1455 14.2 (1.0) 51.7 22.6 9.0 -0.5 10.0
50th 1638 14.0 (0.9) 47.5 22.7 8.7 -1.7 5.1
75th 1044 13.8 (1.0) 50.0 22.9 11.2 0.5 18.3
Shanshi 1036 13.9 (1.0) 56.9 22.6 9.7 -0.4 13.8
Qunxing 139 14.5 (1.4) 50.0 22.1 9.5 -0.4 6.7
Total 5312 14.1 (1.1) 51.2 22.6 9.6 -0.5 10.8
Baoqiao District
55th 896 14.0 (1.0) 48.3 22.9 8.9 -1.8 10.1
64th 1318 14.1 (0.9) 50.0 22.1 9.7 -2.6 8.3
Luyuan 581 14.0 (0.9) 55.0 22.5 9.2 -2.2 6.7
Dianjian 878 13.7 (0.9) 50.0 22.7 10.6 0.1 15.0
Total 3673 13.9 (1.0) 50.8 22.5 9.6 -1.6 8.8
  1. * Mean household wealth index per school, household wealth index computed by principal component analysis [14];
  2. **Overweight and obesity was defined by IOTF BMI cut offs [15]