Table 4.

Percent of Women and Infants by Treatment Group with 25(OH)D <50 nmol/L at Visits 1, 4, and 7 Substratified by Feeding Type

Feeding type	25(OH)D <50 nmol/L by treatment, n (%)		p-Value
	400 IU	6,400 IU
	n = 185	n = 177
Mothers
Visit 1
Exclusive breastfeeding	27 (17.9)	21 (14.5)	0.4
Exclusive formula-feeding	10 (29.4)	13 (40.6)	0.3
Visit 4
Exclusive breastfeeding	11 (11.6)	0 (0.0)	0.0003
Combination feeding	7 (46.7)	0 (0.0)	0.06
Exclusive formula-feeding	6 (23.1)	5 (17.2)	0.6
Visit 7
Exclusive breastfeeding	10 (17.0)	0 (0.0)	0.0003
Combination feeding	4 (17.4)	0 (0.0)	0.1
Exclusive formula-feeding	8 (32.0)	5 (21.7)	0.4
Infants
Visit 1
Exclusive breastfeeding	100 (69.4)	83 (61.5)	0.2
Exclusive formula-feeding	6 (18.2)	6 (18.8)	0.9
Visit 4
Exclusive breastfeeding	8 (8.7)	3 (3.4)	0.2
Combination feeding	0 (0.0)	0 (0.0)	n/a
Exclusive formula-feeding	1 (3.9)	0 (0.0)	0.5
Visit 7
Exclusive breastfeeding	2 (3.6)	2 (3.3)	1.0
Combination feeding	0 (0.0)	0 (0.0)	n/a
Exclusive formula-feeding	1 (4.0)	0 (0.0)	1.0

n/a, not applicable.