Skip to main content

Table 4 Unadjusted and adjusted odds of preterm birth for most invasive treatment in the cycle of conception

From: Fertility treatments and the risk of preterm birth among women with subfertility: a linked-data retrospective cohort study

  Unadjusted OR [95% CI] Adjusted OR [95% CI] Adjusted OR, with adjustment for multiple gestation [95% CI]
Most invasive treatment used during cycle of conception    
 None Reference Reference Reference
 Drugs 2.17 (1.08, 4.36) 2.17 (0.99, 4.75) 1.34 (0.52, 3.45)
 IUI 2.75 (1.35, 5.61) 3.17 (1.4, 7.19) 2.16 (0.82, 5.69)
 IVF 3.09 (1.74, 5.48) 4.24 (2.05, 8.77) 1.46 (0.59, 3.58)
Etiology    
 No female factor   Reference Reference
 Any female factor   2.99 (1.5, 5.97) 3.00 (1.32, 6.79)
 No male factor   Reference Reference
 Any male factor   1.01 (0.58, 1.76) 0.99 (0.51, 1.95)
Multiple gestation    
 Singleton    Reference
 Multiple    27.91 (13.25, 58.79)
Maternal age at delivery    
 ≤ 30   Reference Reference
 31+   1.03 (0.5, 2.09) 0.91 (0.38, 2.19)
Paternal age at delivery    
 ≤ 30   Reference Reference
 31+   1.54 (0.8, 2.97) 1.42 (0.64, 3.13)
BMI category (at delivery)    
 Underweight/Normal   Reference Reference
 Overweight/Obese   0.9 (0.52, 1.55) 1.19 (0.61, 2.33)
Income    
 Less than $50,000   Reference Reference
 50,000–$99,999   1.13 (0.6, 2.14) 0.81 (0.38, 1.72)
 Over $100,000   0.71 (0.28, 1.84) 0.85 (0.27, 2.73)
Education level    
 Less than college grad   Reference Reference
 College grad or more   0.7 (0.4, 1.23) 0.84 (0.42, 1.67)
Religion    
 Non-LDS   Reference Reference
 Latter-day Saint   0.87 (0.45, 1.67) 0.73 (0.32, 1.66)
Attempt duration ending in conception    
 < 24   Reference Reference
 ≥ 24   0.59 (0.33, 1.06) 0.66 (0.33, 1.34)