Table 1, Cumulative probability of conceiving a clinical pregnancy by the number of menstrual cycles - Fertility problems: assessment and treatment

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Table 1Cumulative probability of conceiving a clinical pregnancy by the number of menstrual cycles

Cumulative probability of conceiving a clinical pregnancy by the number of menstrual cycles attempting to conceive in different age categories (assuming vaginal intercourse occurs twice per week) (Reproduced with permission: Dunson DB, Baird DD, Colombo B [2004]. Increased infertility with age in men and women. Obstetrics and Gynecology 103: 51–6).

Age category (years)	Pregnant after 1 year (12 cycles) (%)	Pregnant after 2 years (24 cycles) (%)
19–26	92	98
27–29	87	95
30–34	86	94
35–39	82	90

From: Fertility problems: assessment and treatment

Fertility problems: assessment and treatment.

NICE Clinical Guidelines, No. 156.

London: National Institute for Health and Care Excellence (NICE); 2017 Sep.

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