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At the same time, according to the NSFG, contraceptive use at first intercourse rose to 78% among females aged 15-19 in 1995, from 65% in the late 1980s and 48% in the early 1980s.
Researchers used the nationally representative NSFG data to examine dual contraceptive behavior among two groups of 15-44-year-old women: 1,561 who reported using a highly effective contraceptive method during the month in which they were interviewed, and 1,552 who reported using such a method at their last intercourse in the prior three months.
Markedly different survey designs and definitions appear to be the cause of the large discrepancy between the NAMCS and the NSFG estimates.
The MEPS sampling frame, for example, is now drawn from the NHIS sample, allowing the surveys to share important information on their common respondents (see Table 2), and NHIS will also be linked to the NHANES and NSFG in their sample and questionnaire designs.
NSFG is an in-person, household survey that uses a stratified, multistage probability sample of females and males aged 15-44 years to create nationally representative estimates of sexual behaviors, attitudes, and contraceptive use (8).
We use data from the 2002 NSFG, which surveyed 7,643 women aged 15-44; Hispanics and non-Hispanic blacks were oversampled.
First, estimates of contraceptive use are self-reported; however, NSFG was designed specifically to minimize potential sources of response error (4).
NSFG is an in-person, household survey based on a stratified, multistage probability sample that is nationally representative of eligible women and men aged 15-44 years.
Data were corrected for underreporting of abortion in the NSFG, which is known to be substantial and likely would lead to underestimates of contraceptive failure.
While the 2002 cycle of the NSFG collected a substantial amount of data about emergency contraception, the only published analyses that we are aware of have been summary statistics in which emergency contraception has been included in descriptions of use of various methods of birth control or in which use has been shown according to women's age, race or ethnicity.
(6-23) Many of these studies are based on public records (e.g., birth records) or on large, nationally representative surveys (e.g., the NSFG), and are basically demographic.
Unfortunately, the NSFG has no other appropriate measure of access or barriers to health care.
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