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Table 2 BMI of and school environment factors in Xi'an City

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

School Factors School No. or mean (SD) Student No. BMI (SD) Unadjusted Adjusted *
      Coef** 95% CI Coef** 95% CI
Playground per person (10 m 2 ) 0.5 (0.4)*** N/A N/A -0.5 -1.2, 0.3 -0.2 -0.9, 0.4
School oval Yes 27 1619 20.0 (3.4) Reference
  No 3 173 19.3 (3.1) -0.6 -1.6, 0.3 -0.6 -1.4, 0.2
Morning exercise Yes 23 1379 19.9 (3.4) Reference
  No 7 413 20.1 (3.3) 0.3 -0.5, 1.0 0.1 -0.6, 0.7
Class recess exercise Yes 28 1673 19.9 (3.4) Reference
  No 2 119 20.2 (2.9) 0.3 -1.0, 1.5 -0.2 -1.8, 0.9
Sports meetings twice a year 13 779 19.7 (3.2) Reference
  Once a year 15 893 19.8 (3.3) 0.1 -0.4, 0.6 0.1 -0.3, 1.6
  Once in 2 years 2 120 22.0 (4.0) 2.2 1.2, 3.2 1.9 1.0, 2.8
Health education Yes 27 1614 19.8 (3.3) Reference
  No 3 178 21.4 (3.9) 1.6 0.7, 2.4 1.2 0.4, 2.0
Soft drinks at school shops No 2 181 19.8 (3.2) Reference
  yes 8 1619 21.2 (4.1) 1.4 0.5, 2.3 1.2 0.4, 2.0
Fast food outlets No 21 1259 19.7 (3.8) Reference
  Yes 9 541 20.5 (3.1) 0.8 0.2, 1.5 0.7 0.1, 1.2
Number Fast food outlets 0 16 954 19.2 (3.0) Reference
  1 8 477 20.3 (3.5) 0.8 0.1, 1.4 0.6 -.0.02, 1.1
  ≥2 6 361 20.5 (3.9) 1.0 0.3, 1.7 0.8 0.1, 1.4
Bike riding (allowed) Yes 29 1740 20.0 (3.4) Reference
  No 1 60 18.7 (2.4) -1.2 -2.9, 0.4 -0.8 -2.2, 0.6
  1. * Adjusted for significant socio-demographic factors including age, parental education, parental BMI, and household wealth Index.
  2. **coefficient of school factors was from linear mixed effect models
  3. *** mean playground per person in 10 m2 with the standard deviation.