Table 2 Stratification analysis of the correlation between parity, season at sampling, alkaline phosphatase, and 25(OH)D concentrations (One-way ANOVA, Post Hoc Multiple Comparison)
Parameters | 25(OH)D concentration | Group A | Group B | P value | 95% CI |
|---|---|---|---|---|---|
Parity | |||||
 0 | 59.2 ± 12.6 | 0 | 1 | 0.415 | (-0.76, 1.85) |
 1 | 58.7 ± 12.4 |  |  ≥ 2 | 0.044 | (-5.85, -0.08) |
  ≥ 2 | 62.2 ± 13.1 | 1 |  ≥ 2 | 0.018 | (-6.42, -0.59) |
Season at sampling | |||||
 Spring | 53.7 ± 11.2 | Spring | Summer |  < 0.001 | (-8.43, -4.73) |
 Summer | 60.3 ± 12.3 |  | Autumn |  < 0.001 | (-18.08, -14.20) |
 Autumn | 69.8 ± 8.8 |  | Winter | 0.021 | (-5.94, -0.32) |
 Winter | 56.8 ± 11.4 | Summer | Autumn |  < 0.001 | (-11.56, -7.57) |
| Â | Â | Â | Winter | 0.009 | (0.60, 6.30) |
|  |  | Autumn | Winter |  < 0.001 | (-15.92, -10.10) |
ALP | |||||
  < 45 | 54.8 ± 13.2 |  < 45 | 45–125 | 0.005 | (-7.90, -1.41) |
 45–125 | 59.5 ± 12.7 |  |  > 125 | 0.004 | (-10.19, -1.98) |
  ≥ 125 | 60.9 ± 11.6 | 45–125 |  > 125 | 0.316 | (-4.23, 1.37) |