Fertility in four regions spanning large contrasts in serum levels of widespread persistent organochlorines: a cross-sectional study

Table 4 Fecundability ratios^a (FR) for couples in Kharkiv, Greenland and Sweden in comparison with couples in Warsaw.

	Number pregnant (row percentage)				FR crude	FR adjusted^b	95% CI
	0 – 3 months	4 – 6 months	6 – 12 months	> 12 months
Warsaw	208 (55)	38 (10)	60 (16)	70 (19)	1.00	1.00	-
Kharkiv	147 (48)	37 (12)	39 (13)	84 (27)	0.80	0.64	0.53 – 0.79
Greenland	295 (57)	61 (12)	85 (46)	80 (15)	1.07	1.00	0.80 – 1.27
Sweden	355 (68)	75 (15)	36 (7)	53 (10)	1.35	1.26	1.01 – 1.57

a) Adjustment for female age (continuous), female current smoking (yes/no), primiparity (yes/no), daily sexual intercourse (yes/no) and current employment (yes/no). All covariates except current employment contributed significantly to the model. Female urogenital disease or infection, low and high body mass index and use of oral contraceptives did not change at least one of the risk estimates with at least 10%.
b) The corresponding age and smoking adjusted FR among nulliparous women were (i) Kharkiv: 0.59 (95% CI, N = 503) (ii) Greenland: 0.90 (95% CI 0.68–1.19, N = 187) and Sweden FR 0.90, (95% CI 0.73 – 1.11), N = 429]. The Swedish risk estimate based upon the first planned pregnancy.

ISSN: 1476-069X