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Table 2 Trends in BMI z-scores among Chinese children and adolescents aged 7-18y: 2011–2015

From: Prevalence and stabilizing trends in overweight and obesity among children and adolescents in China, 2011-2015

   2011   2015 P
N Mean ± SD N Mean ± SD
All 1458 −0.0749 ± 1.3632 1084 0.0528 ± 1.4028 0.0211
Age
 7–11 762 0.0421 ± 1.5078 698 0.0737 ± 1.4251 0.6818
 12–18 696 −0.2031 ± 1.1726 386 0.0150 ± 1.3626 0.0083
Gender
 Boys 743 0.0426 ± 1.4529 554 0.2522 ± 1.4710 0.0107
 Girls 715 −0.1970 ± 1.2527 530 −0.1556 ± 1.2968 0.5700
Area
 Urban 440 0.1275 ± 1.3571 282 0.3732 ± 1.3381 0.0173
 Rural 1018 −0.1625 ± 1.3572 802 −0.0599 ± 1.4085 0.1155
Region
 North 461 0.3738 ± 1.3626 302 0.4911 ± 1.4773 0.2612
 South 997 −0.2824 ± 1.3133 782 −0.1165 ± 1.3360 0.0087