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Univariate analysis of maternal serum 25-(OH)D level and incidence of SGA.
| Vitamin D level | Total number | Number of SGA | Incidence of SGA (%) | Relative hazard ratio (RR) | 95% CI of RR | P |
| Deficiency group | 2565 | 410 | 15.98 | 7.80 | 1.070∼56.867 | .016∗ |
| Insufficiency group | 473 | 12 | 2.54 | 1.07 | 0.135∼8.414 | .951 |
| Sufficiency group | 42 | 1 | 2.38 | 1.00 | --- | --- |
