Table 3 Serum concentration of retinol among 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 (retinol: ng/ml) Female (retinol: ng/ml) Z P value Urban area (retinol: ng/ml) Rural area (retinol: ng/ml) Z P value
N Median 25% 75% N Median 25% 75% N Median 25% 75% N Median 25% 75%
6 93 0.29 0.24 0.35 87 0.31 0.26 0.37 1.676 0.094 87 0.31 0.26 0.38 93 0.29 0.23 0.35 −1.798 0.072
7 117 0.31 0.25 0.37 125 0.29 0.24 0.35 −0.882 0.378 114 0.33 0.28 0.38 128 0.28 0.22 0.34 −4.512 0.000
8 138 0.31 0.26 0.37 122 0.32 0.27 0.38 0.48 0.631 131 0.33 0.29 0.38 129 0.29 0.23 0.35 −4.08 0.000
9 137 0.31 0.25 0.37 127 0.34 0.29 0.42 3.343 0.001 128 0.34 0.29 0.41 136 0.30 0.24 0.37 −3.559 0.03
10 125 0.33 0.27 0.40 133 0.34 0.29 0.40 0.548 0.584 139 0.35 0.29 0.40 119 0.33 0.27 0.39 −1.387 0.165
11 128 0.36 0.30 0.42 146 0.37 0.31 0.42 0.918 0.359 129 0.37 0.32 0.43 145 0.35 0.29 0.42 −2.046 0.041
12 152 0.37 0.29 0.44 134 0.38 0.31 0.46 0.637 0.524 148 0.40 0.34 0.47 138 0.34 0.28 0.42 −4.439 0.000
13 133 0.38 0.33 0.47 133 0.40 0.32 0.49 0.473 0.636 141 0.44 0.37 0.52 125 0.34 0.26 0.41 −7.185 0.000
14 40 0.36 0.27 0.48 40 0.38 0.30 0.52 0.51 0.61 35 0.46 0.34 0.56 45 0.33 0.24 0.44 −3.575 0.000
15 88 0.39 0.31 0.49 101 0.39 0.31 0.48 −0.263 0.793 94 0.39 0.33 0.48 95 0.39 0.29 0.49 −0.08 0.936
16 121 0.40 0.34 0.45 117 0.37 0.31 0.43 −2.378 0.017 104 0.38 0.33 0.44 134 0.38 0.30 0.44 −0.595 0.552
17 43 0.37 0.30 0.45 39 0.40 0.28 0.48 0.023 0.981 40 0.37 0.30 0.45 42 0.40 0.30 0.47 0.32 0.749
Total 1315 0.34 0.28 0.42 1304 0.35 0.29 0.42 1.671 0.095 1290 0.37 0.31 0.43 1329 0.33 0.26 0.4 −9.519 0.000
  1. P values are for the comparison of serum concentration of retinol 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 serum retinol among different age (H = 269.958, P < 0.0007).
  5. Retinol serum concentration of retinol.