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Table 2 Mixed effects estimates on physical activity (PA) levels (MET-hrs/wk) among Chinese children, coefficient (95% CI)

From: Age, period and cohort effects and the predictors of physical activity and sedentary behaviour among Chinese children, from 2004 to 2011

PA Model 1 Model 2 Model 3 Model 4
Age 6.12(5.28,6.96) 6.21(5.36,7.07) 5.6(4.72,6.49) 5.75(4.84,6.65)
Survey year (ref: 2004)
 2006 0.40(−13.74,14.55) −1.05(−15.42,13.31) −3.31(−18.61,11.99) −5.18(−20.7,10.34)
 2009 12.98(−2.78,28.74) 12.64(−3.25,28.54) 10.15(−6.39,26.69) 9.97(−6.70,26.64)
 2011 −23.6(−9.14,-38.07) −17.73(−1.77,-33.69) −20.2(−5.28,-35.13) 14.56(−1.95,31.06)
2006*Age −0.10(−1.26,1.07) −0.08(−1.25,1.1) 0.41(−0.84,1.66) 0.40(−0.86,1.66)
2009*Age −1.04(−2.37,0.29) −1.01(−2.35,0.34) −0.60(−1.98,0.79) −0.65(−2.05,0.76)
2011*Age −1.91(−3.15,-0.68) −1.20(−2.55,0.15) −1.31(−2.57,-0.05) −0.96(−2.04,-0.73)
Gender −6.38(−9.85,-2.9) −5.86(−9.52,-2.2) −6.24(−9.73,-2.75) −5.74(−9.42,-2.06)
Inverse Mill’s Ratio   3.99(−1.51,9.48)   5.80(0.06,11.53)
Community Urbanicity   −0.15(−0.24,-0.05)   −0.07(−0.18,-0.03)
Bicycle ownership    2.07(−1.24,5.37) 2.34(−1.12,5.79)
Vehicle ownership    0.71(−2.58,4.01) 0.06(−3.42,3.53)
No of Computers    −4.80(−9.03,-0.57) −4.74(−9.43,-0.05)
No of Household members    0.71(−0.57,1.99) 0.41(−0.95,1.77)
Overweight/Obese    0.61(−3.91,5.14) 2.88(−1.97,7.72)
Household income    0.60(−1.68,2.89) 0.65(−1.79,3.08)
Number of observations 5697 5319 4532 4177
Number of individuals 3528 3162 3022 2676
  1. Notes: Data from CHNS 2004–2011; bold values denote statistical significance at p < 0.05