Table 1.

Maternal serum vitamin D concentrations and the percentages with levels <25, 50 and 60 nmol/l for each trimester

	First trimester	Second trimester	Third trimester
No	19	42	68
Mean (SD), nmol/l	32 (15.6)	33 (17.6)	48 (20.1)
Median	30	30	46
Min–max	8–57	6–81	14–105
Percentage <25 nmol/l	32	40	12
Percentage <50 nmol/l	74	79	56
Percentage <60 nmol/l	100	95	78