Table 4.

Cox proportional hazards regression analysis for time to pregnancy as a function of Alternative Healthy Eating Index for Pregnancy (AHEI-P)^{( 8 )} score (tertile) and selected covariates for couples participating in the Lifestyle and Fertility (ISIS) study (n 117). Hazard ratio (HR) with 95 % CI for time to pregnancy outcomes^*

	HR	95 % CI	P value
Clinical pregnancy (n 80)
Model 1†
AHEI-P medium	1·23	0·67, 2·27	0·50
AHEI-P high	1·20	0·66, 2·17	0·56
Model 2‡
AHEI-P medium	1·34	0·70, 2·53	0·38
AHEI-P high	1·25	0·66, 2·35	0·49
Model 3§
AHEI-P medium	1·50	0·72, 3·14	0·28
AHEI-P high	1·43	0·68, 2·95	0·35
Model 4║
AHEI-P medium	1·64	0·78, 3·47	0·19
AHEI-P high	1·55	0·71, 3·39	0·27
Clinical pregnancy that resulted in live birth (n 69)
Model 1†
AHEI-P medium	1·35	0·70, 2·59	0·37
AHEI-P high	1·14	0·59, 2·20	0·70
Model 2‡
AHEI-P medium	1·46	0·74, 2·90	0·28
AHEI-P high	1·19	0·59, 2·38	0·63
Model 3§
AHEI-P medium	1·48	0·68, 3·21	0·32
AHEI-P high	1·23	0·56, 2·69	0·60
Model 4║
AHEI-P medium	1·63	0·74, 3·59	0·22
AHEI-P high	1·36	0·59, 3·13	0·46
Pregnancy loss (n 11)
Model 1†
AHEI-P medium	1·02	0·16, 6·56	0·99
AHEI-P high	0·65	0·14, 3·12	0·59
Model 2‡
AHEI-P medium	0·99	0·15, 6·50	0·99
AHEI-P high	0·55	0·10, 3·02	0·49
Model 3§
AHEI-P medium	2·72	0·26, 28·92	0·41
AHEI-P high	1·25	0·13, 12·32	0·85
Model 4║
AHEI-P medium	2·31	0·21, 25·89	0·50
AHEI-P high	0·93	0·09, 10·22	0·95

^*The sample size does not include the n 15 who were censored at baseline visit. All covariates are for the female unless otherwise indicated. The reference group is the lowest tertile of AHEI-P. P values determined by Cox proportional hazards regression.

^†Adjusted for age and energy intake.

^‡Adjusted for age, energy intake and BMI.

^§Adjusted for age, energy intake, BMI, male education and male smoking status.

^║Adjusted for age, energy intake, BMI, male education, male smoking status and male AHEI-P score.