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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