Table 1.
Serum 25(OH)D, blood lead and Hb levels according to age group and gender among 1218 children aged from 6 months to 14 years, south-west China, 2011
| Boys† | Girls† | |||
|---|---|---|---|---|
| Variable/Age group* | Mean | sd | Mean | sd |
| 25(OH)D (ng/ml) | ||||
| <1 year (n 216) | 45·47 | 18·36 | 44·07 | 15·81 |
| 1–3 years (n 592) | 36·18 | 16·36 | 35·61 | 14·69 |
| 4–7 years (n 271) | 24·61 | 10·61 | 24·09 | 10·71 |
| 8–14 years (n 139) | 22·47 | 10·70 | 19·55 | 9·13 |
| Pb (μg/dl) | ||||
| <1 year (n 216) | 4·91 | 1·34 | 4·76 | 1·34 |
| 1–3 years (n 592) | 5·64 | 2·02 | 5·46 | 1·81 |
| 4–7 years (n 271) | 6·13 | 1·64 | 5·96 | 2·17 |
| 8–14 years (n 139) | 6·30 | 1·88 | 6·56 | 1·78 |
| Hb (g/dl) | ||||
| <1 year (n 216) | 11·93 | 1·28 | 11·86 | 0·99 |
| 1–3 years (n 592) | 12·51 | 0·99 | 12·51 | 0·88 |
| 4–7 years (n 271) | 12·59 | 1·39 | 12·52 | 1·00 |
| 8–14 years (n 139) | 13·46 | 1·23 | 13·26 | 0·93 |
25(OH) D, 25-hydroxyvitamin D.
*Univariate linear regression between (i) age and vitamin D: r 2 = 0·194, t = −17·116, P < 0·001; (ii) age and Pb: r 2 = 0·052, t = 8·182, P < 0·001; (iii) age and Hb: r 2 = 0·005, t = 2·618, P = 0·009.
†Difference in mean value between boys and girls (t test): vitamin D, P = 0·972; Pb, P = 0·113; Hb, P = 0·24.