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Table 3 Fixed-effect parameter estimates from general linear mixed effects models

From: Body mass index and physical fitness among Chinese adolescents from Shandong Province: a cross-sectional study

Fitness Test

SES Strata (gross domestic product per capita)

Total Sample b-coefficient

(95% C.I.)

Girls b-coefficient

(95% C.I.)

Boys b-coefficient

(95% C.I.)

BMI (kg/m2)

50,000–99,999 RMB

0.30 (−0.27, 0.89)

0.40 (−0.12, 0.91)

0.23 (−0.46, 0.93)

 

0–49,999 RMB

−0.02 (−0.65, 0.60)

0.03(−0.52, 0.58)

− 0.07 (− 0.82, 0.68)

Dash Run (sec)

50,000–99,999 RMB

− 0.11 (− 0.47, 0.25)

− 0.17 (− 0.65, 0.31)

−0.06 (− 0.48, 0.35)

 

0–49,999 RMB

0.25 (− 0.17, 0.60)

0.16 (− 0.35, 0.68)

0.28 (− 0.16, 0.73)

Long Jump (cm)

50,000–99,999 RMB

5.0 (−6.9, 17.0)

−2.3 (−12.7, 8.1)

2.1 (−4.0, 28.1)

 

0–49,999 RMB

1.3 (−11.5, 14.2)

−5.4 (−16.6, 5.8)

7.4 (−9.9, 24.7)

Sit and Reach (cm)

50,000–99,999 RMB

0.22 (−9.2, 9.7)

0.16 (−8.53, 8.9)

0.24 (−9.9, 10.4)

 

0–49,999 RMB

5.1 (−5.1, 15.3)

4.4 (−4.5, 13.8)

5.9 (− 5.1, 16.9)

Girl Distance Run (sec)

50,000–99,999 RMB

 

18.5†

(4.6, 32.5)

 
 

0–49,999 RMB

 

26.8†

(11.8, 41.8)

 

Boy Distance Run (sec)

50,000–99,999 RMB

  

15.8†

(2.2, 29.5)

Sit-up (Girls; reps)

50,000–99,999 RMB

 

−0.24 (−4.8, 4.3)

 
 

0–49,999 RMB

 

−2.7 (−7.6, 2.2)

 

Pull-ups (Boys; reps)

50,000–99,999 RMB

  

−1.05 (−2.5, 0.4)

 

0–49,999 RMB

  

−0.39 (−2.0, 1.1)

  1. b-coefficients are adjusted for clustering within Region and age; 95% C.I. stands for the 95% Confidence Interval; RMB stands for Renminbi; BMI stands for Body Mass Index; SES stands for Socio-Economic Status; referent for SES is ≥100,000 RMB; bold and † denotes statistical significance, p ≤ 0.05