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

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

  Number pregnant (row percentage) FR crude FR adjustedb 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
  1. 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%.
  2. 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.