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Table 5 Fecundability ratiosa (FR) for couples providing semen samples in comparison with couples not providing semenb.

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 adjusted 95% CI
  0 – 3 months 4 – 6 months 6 – 12 months > 12 months    
Warsaw        
- sample 123 (56) 23 (10) 37 (17) 38 (17) 1.00 1.00 -
+sample 85 (55) 15 (10) 23 (15) 32 (20) 0.91 0.90 0.7 – 1.1
Kharkiv        
- sample 103 (49) 27 (13) 27 (13) 53 (25) 1.00 1.00 -
+sample 44 (46) 10 (10) 12 (12) 31 (32) 0.87 1.02 0.8 – 1.4
Greenland        
- sample 205 (60) 33 (10) 50 (15) 53 (16) 1.00 1.00 -
+sample 89 (50) 28 (15) 35 (20) 27 (15) 0.89 0.88 0.7 – 1.1
All        
- sample 431 (56) 83 (11) 114 (15) 144 (19) 1.00 1.00 -
+sample 218 (51) 53 (12) 70 (16) 90 (21) 0.89 0.91 0.80 – 1.04
  1. a) Adjustment for region (only the overall estimate), female age (continuous) and current female smoking (yes/no).
  2. b) Sweden not included (TTP and semen studies with marginal overlap).