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. Author manuscript; available in PMC: 2020 Sep 9.
Published in final edited form as: Utah Womens Health Rev. 2020 Jul 31;2020:https://uwhr.utah.edu/2020/07/.

Table 2:

Unadjusted association between BMI and self-reported months trying to get pregnant.

BMI Months trying to get pregnant
0–3 months 4–6 months 7–12 months 13–24 months >24 months
PR (95% CI)
Continuous BMI 1.00 1.03 (1.01, 1.05) 1.03 (1.01, 1.05) 1.06 (1.04, 1.08) 1.08 (1.06, 1.10)
Categorical BMI
Underweight 1.00 1.00 (0.60, 1.60) 0.93 (0.54, 1.61) 0.19 (0.05, 0.79) 0.82 (0.39, 1.73)
Normal weight 1.00 1.00 1.00 1.00 1.00
Overweight 1.00 1.14 (0.88, 1.47) 1.34 (1.02, 1.76) 0.99 (0.68, 1.43) 1.62 (1.16, 2.25)
Obese 1.00 1.58 (1.22, 2.06) 1.39 (1.03, 1.89) 1.92 (1.36, 2.70) 3.31 (2.43, 4.50)

Pre-pregnancy BMI was calculated using birth certificate reported height and weight, and categorized in standard groups for underweight (<18.5 kg/m2); normal (18.5–24.9 kg/m2); overweight (25.0–29.9 kg/m2); and obese (30 kg/m2 or higher).