Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.
From the 2002 National Survey of Family Growth:
Please write the methods you used each month on the calendar. I need to know about all the methods you used, so if you used more than one method, please write down all methods you used that month.
How many months or weeks had you been pregnant when the baby was born/that pregnancy ended? [Note: this yields date pregnancy began.]
From the 2001 Abortion Patient Survey:
Before you found out you were pregnant, what was the LAST contraceptive method that you used to prevent pregnancy, including rhythm, withdrawal or condoms?
In what month and year did you stop using that method?
For about how many months in a row had you been using that method?
Had you ever used that method before the months specified above?
Had you stopped using all methods to prevent pregnancy before you became pregnant this time?
Pregnancies include live births, miscarriages, or induced abortions.
Females are considered to have experienced pregnancy despite use of a reversible method if there was continuous method use (in 12-month intervals) and they became pregnant during a month of use of one or more of the following methods: birth control pills, condom (rubber), diaphragm, foam/jelly/cream, cervical cap, suppository, insert, TodayTM sponge, female condom (vaginal pouch), IUD, coil, loop, Norplant, Depo-provera, injectables, withdrawal (pulling out), rhythm/natural family planning, or emergency contraception/morning-after pill.
NSFG data are adjusted for underreporting of abortions using data from The Guttmacher Institute’s Abortion Patient Survey. Detailed information on adjustment procedure, contraceptive methods and failure rates have been published by The Guttmacher Institute.
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