. Author manuscript; available in PMC: 2012 Oct 1.

Published in final edited form as: J Bone Miner Res. 2011 Oct;26(10):2341–2357. doi: 10.1002/jbmr.463

Table 4.

Secondary Outcome: Achieving Total Circulating 25(OH)D ≥ 80 nmoL around Time of Delivery by Treatment Group

25(OH)D nmol/L	2000 IU N (%)	400 IU N (%)	Risk ratio (95% CI)	Risk difference (95% CI)
≥80 nmol/L	93 (79.5)	57 (52.3)	1.5200 (1.2426–1.8594)	0.2719 (0.1530–0.3909)
	4000 IU N (%)	400 IU N (%)	Risk ratio (95% CI)	Risk difference (95% CI)
≥80 nmol/L	94 (83.9)	57 (52.3)	1.6049 (1.3183–1.9540)	0.3163 (0.2005–0.4322)
≥80 nmol/L	4000 IU N (%)	2000 IU N (%)	Risk ratio (95% CI)	Risk difference (95% CI)
	94 (83.9)	93 (79.5)	1.0559 (0.9340–1.1936)	0.0444 (−0.0555–0.1443)

Vitamin D sufficiency defined a priori as a total circulating 25(OH)D concentration of ≥80 nmoL (32 ng/mL). The following comparisons were made: 2000 IU group vs. the 400 IU group; 4000 IU group vs. 400 IU group; and lastly, the 4000 IU group vs. the 2000 IU group. Risk ratios and risk differences were reported for each comparison with 95% confidence intervals (CI).