Table 1 BMI characteristics of children and adolescents stratified by age, gender and living area.

From: Sociodemographic disparity in the nutritional status among children and adolescents in Zhejiang Province

Age (years)* Male (BMI: kg/m2) Female (BMI: kg/m2) Z P value Urban area (BMI: kg/m2) Rural area (BMI: kg/m2) Z P value
N Median 25% 75% N Median 25% 75% N Median 25% 75% N Median 25% 75%
6 124 15.62 14.69 17.33 113 15.19 14.28 16.28 −2.586 0.01 135 15.55 14.41 17.16 102 15.15 14.46 16.39 −1.068 0.285
7 132 15.49 14.56 16.72 149 15.52 14.74 16.78 0.315 0.753 135 15.76 14.80 17.12 146 15.38 14.59 16.25 −2.42 0.016
8 149 16.53 15.29 18.19 131 15.78 14.45 16.86 −3.781 0.000 147 16.44 15.34 17.70 133 15.68 14.74 17.10 −2.689 0.007
9 142 16.72 15.46 19.00 135 15.78 14.58 17.66 −3.733 0.000 139 16.65 15.16 19.33 138 15.90 14.86 17.69 −2.417 0.016
10 128 17.76 15.71 21.31 137 16.65 15.37 19.46 −2.424 0.015 140 17.47 15.69 20.37 125 16.48 15.37 19.70 −1.684 0.092
11 134 17.74 16.01 20.13 147 16.97 15.50 19.06 −2.036 0.042 130 18.03 16.36 20.15 151 16.86 15.38 18.97 −3.029 0.002
12 154 18.42 16.51 21.26 136 18.67 16.53 20.01 −0.251 0.802 149 18.99 17.31 21.54 141 17.70 16.21 20.28 −2.841 0.004
13 134 18.70 17.21 21.12 134 19.59 17.69 22.09 1.775 0.076 141 19.54 17.57 22.37 127 18.70 17.09 21.23 −1.48 0.139
14 42 19.56 17.90 21.68 41 19.22 18.13 21.11 0.419 0.675 35 19.59 18.18 21.63 48 19.31 17.92 20.73 −1.134 0.257
15 92 20.33 18.70 24.03 110 20.11 18.58 22.24 −1.252 0.211 104 20.59 18.63 23.53 98 20.11 18.54 22.48 −1.75 0.24
16 137 20.31 18.46 22.36 126 20.11 18.25 22.58 −0.361 0.718 125 20.09 18.31 22.36 138 20.25 18.36 22.53 0.48 0.631
17 48 19.61 18.03 21.12 43 20.32 19.03 21.54 1.399 0.162 47 20.05 18.37 21.76 44 19.74 18.47 21.47 0.016 0.987
Total 1416 17.79 15.9 20.42 1402 17.35 15.49 19.99 −3.727 0.000 1427 17.91 15.91 20.49 1391 17.24 15.43 19.92 −4.756 0.000
  1. P values are for the comparison of BMI between genders and between living areas.
  2. Bold values indicate statistically significant P values.
  3. For multiple comparisons among different age, the P value is 0.00074627 after Bonferroni correction.
  4. An asterisk (*) denotes significant difference on BMI among different age (H = 890.645, P < 0.0007).
  5. BMI body mass index.