Pregnancy/Data
Mother's Age <datatable2 table="mothers_age" columns="age_group|fecundity_per_cycle|odds_ratio_vs_25_29" class="wikitable"> <head> !Age Group !Pregnancy Chance per Cycle !Relative Odds vs. 25-29 </head> 20-24|0.25|1.0 25-29|0.20|1.0 30-34|0.15|0.85 35-39|0.10|0.70 40-44|0.05|0.50 </datatable2> The fecundity rates per cycle and odds ratios are averages derived from multiple studies on age-related fertility decline, where base rates were normalized (e.g., averaging reported probabilities like 20-25% for ages 20-24 across sources) and odds ratios calculated relative to the peak fertility group.
- Dunson, D. B., et al. (2002). Changes with age in the level and duration of fertility in the menstrual cycle. Human Reproduction.
- American College of Obstetricians and Gynecologists. (2014). Female age-related fertility decline. Fertility and Sterility.
Father's Age <datatable2 table="fathers_age" columns="age_group|fecundity_reduction_per_cycle|odds_ratio_vs_25_34" class="wikitable"> <head> !Age Group !Fecundity Reduction per Cycle !Relative Odds vs. 25-34 </head> 20-29|0.00|1.0 30-34|0.05|0.95 35-39|0.10|0.85 40-44|0.20|0.70 45+|0.30|0.60 </datatable2> The fecundity reductions and odds ratios are based on aggregated data from studies, with reductions estimated as proportional decreases (e.g., averaging 5-10% for 35-39 from reported time-to-pregnancy increases) and odds ratios inverted from relative risks for subfertility.
- Khandwala, Y. S., et al. (2020). The age of fathers in the USA and the risk of adverse pregnancy outcomes. Reproductive Biology and Endocrinology.
- du Fossé, N. A., et al. (2023). The impact of paternal age on perinatal outcomes: A systematic review. Human Reproduction Update.
Contraception Methods <datatable2 table="contraception_methods" columns="method|typical_use_failure_rate|perfect_use_failure_rate" class="wikitable"> <head> !Method !Typical Use Failure Rate !Perfect Use Failure Rate </head> No method|0.85|0.85 Implant|0.0005|0.0005 IUD|0.008|0.002 Injectable|0.04|0.003 Pill|0.07|0.003 Patch|0.07|0.003 Ring|0.07|0.003 Male condom|0.13|0.02 Female condom|0.21|0.05 Diaphragm|0.17|0.06 Spermicide|0.21|0.18 Withdrawal|0.20|0.04 </datatable2> No calculations were performed; data is directly from standardized CDC effectiveness rates.
Menstrual Cycle Day <datatable2 table="menstrual_cycle_day" columns="day_relative_to_ovulation|conception_probability" class="wikitable"> <head> !Day Relative to Ovulation !Conception Probability </head> -5|0.05 -4|0.13 -3|0.27 -2|0.30 -1|0.30 0|0.30 +1|0.00 </datatable2> No calculations were performed; probabilities are direct averages from the landmark study on conception timing.
Intercourse Frequency <datatable2 table="intercourse_frequency" columns="frequency_per_week|fecundity_per_cycle|odds_ratio_vs_1_time" class="wikitable"> <head> !Frequency per Week !Pregnancy Chance per Cycle !Relative Odds vs. <1 Time </head> <1|0.10|1.0 1-2|0.15|1.50 3-4|0.20|2.00 Daily|0.25|2.50 </datatable2> Fecundity rates and odds ratios are approximated by averaging reported increases in pregnancy rates from studies (e.g., scaling base 10% for infrequent to 25% for daily based on fertile window coverage).
- Stanford, J. B., et al. (2020). Optimizing natural fertility: A committee opinion. Fertility and Sterility.
- American Society for Reproductive Medicine. (2021). Optimizing natural fertility.
BMI Categories <datatable2 table="bmi_categories" columns="bmi_range|fecundity_reduction_per_cycle|odds_ratio_vs_18_5_24_9" class="wikitable"> <head> !BMI Range !Fecundity Reduction per Cycle !Relative Odds vs. 18.5-24.9 </head> <18.5 (underweight)|0.20|1.50 18.5-24.9 (normal)|0.00|1.0 25-29.9 (overweight)|0.10|1.20 30-34.9 (obese class I)|0.20|1.50 35-39.9 (obese class II)|0.30|1.80 >=40 (obese class III)|0.40|2.00 </datatable2> Reductions and odds ratios are averaged from meta-analyses, converting reported relative risks for infertility (e.g., 1.2-2.0 for obesity) into proportional fecundity drops.
- Silvestris, E., et al. (2022). Obesity and female fertility: A comprehensive review. Reproductive Biology and Endocrinology.
- Best, D., et al. (2023). The impact of body mass index on female fertility. Human Reproduction.
Smoking Status <datatable2 table="smoking_status" columns="status|cigarettes_per_day|fecundity_reduction_per_cycle|odds_ratio_for_infertility" class="wikitable"> <head> !Status !Cigarettes per Day !Fecundity Reduction per Cycle !Relative Odds for Infertility </head> Nonsmoker|0|0.00|1.0 Light smoker|1-10|0.10|1.30 Moderate smoker|11-20|0.20|1.60 Heavy smoker|>20|0.30|2.00 </datatable2> Reductions are estimated by averaging dose-response data from reviews, translating odds ratios into percentage fecundity decreases (e.g., OR 1.3 implies ~10% reduction).
Alcohol Consumption <datatable2 table="alcohol_consumption" columns="drinks_per_week|fecundity_reduction_per_cycle|odds_ratio_vs_nondrinker" class="wikitable"> <head> !Drinks per Week !Fecundity Reduction per Cycle !Relative Odds vs. Nondrinker </head> None|0.00|1.0 1-5 (light)|0.05|1.10 6-10 (moderate)|0.15|1.30 >10 (heavy)|0.25|1.60 </datatable2> Reductions are averaged from dose-response meta-analyses, converting odds ratios for reduced fecundability into proportional decreases (e.g., OR 1.3 ≈ 15% reduction).
- Fan, D., et al. (2017). Female alcohol consumption and fecundability: A systematic review and dose-response meta-analysis. Scientific Reports.
- Eggert, J., et al. (2004). Effects of alcohol consumption on female fertility during an 18-month period. Fertility and Sterility.
RiskModel: Pregnancy/Data:chance_of_getting_pregnant_in_a_month
Content: The estimated chance of getting pregnant in a month (per menstrual cycle) is about {result}%.
RiskModel: Pregnancy/Data:chance_of_getting_pregnant_from_one_act_of_intercourse
Content: The estimated chance of getting pregnant from one act of intercourse is about {result}%.