Table 3: Predictors of clinical pregnancy among 173 women undergoing in vitro fertilization

Variable	Crude OR (95% CI)	p value	Adjusted OR (95% CI)*	p value†
Age, yr	0.96 (0.89–1.04)	0.3	0.98 (0.90–1.07)	0.7
Body mass index	0.92 (0.86–1.00)	0.05	0.94 (0.87–1.01)	0.1
Day 5 embryos transferred (v. day 3)	1.50 (0.81–2.90)	0.2	1.28 (0.61–2.77)	0.5
25-Hydroxy-vitamin D, mmol/L	1.02 (1.00–1.03)	0.2	1.01 (1.00–1.03)	0.05

Note: CI = confidence interval, OR = odds ratio. *Analyses adjusted for age, BMI, number of day 5 embryos transferred and 25 OH-D level. †Statistically significant, p < 0.05.