Table I.

Summary of criteria for initial PPG assignments.

Initial PPG	Criteria for PPG assignment
Low	Using a contraceptive method other than withdrawal or natural family planning AND age 30–44 years OR trying to conceive for ≥12 months OR trying to conceive for 5–11 months AND age 35–49 years OR (not trying to conceive OR don't know) AND (not surgically sterile OR menopausal) AND (age 45–49 years OR had not had sex with a male in the past 3 months OR partner had a vasectomy)
Moderate	Using a contraceptive method other than withdrawal or natural family planning AND age 18–29 years OR trying to conceive for 5–11 months AND age 18–34 years OR had sex with a male within 3 months, age 35–44 years AND (not using any contraception OR using withdrawal OR natural family planning)
High non-tryer	Had sex with a male within 3 months, age 18–34 years and (not using any contraception OR using withdrawal OR natural family planning)
High tryer	Trying to conceive for <5 months

PPG, pregnancy probability group.