Reliability study of reporting of days since last sexual intercourse in Matlab, Bangladesh
Becker, S.; Begum, S.
Journal of Biosocial Science 26(3): 291-299
1994
ISSN/ISBN: 0021-9320 PMID: 7929478 DOI: 10.1017/s0021932000021386Document Number: 320449
Reported data reflect coital frequency accurately in a 24-hour period, but data are more questionable for reports over a four-week period. This study compared responses and reinterviews of 51 of about 2000 women in 1979 in the Matlab study area of Bangladesh. Exact correspondence on the last date of sexual intercourse (within one day) was determined. Out of an original 60 women selected, eight refused and one did not have any intercourse within the past month. Results indicate that 15 of cases (30%) coincided exactly. 26 cases (52%) were within one day, and 39 (78%) were within three days. Four cases involved extreme differences of more than 10 days, and these reports also included only one report for the period and were from women aged over 40 years. A comparison of reports of coital activity with those who refused a reinterview showed that women who refused reinterviews reported values at the extremes of the distribution. Either "last night" or "a month ago" were common responses. There was a significant difference in the number of cases reporting coitus the previous night to the supervisor reinterviewer. Care must be taken in wording sensitive questions having to do with the time of last sexual intercourse. Consideration must be given to the sex and social status of respondent, training of interviewers, and privacy for questionnaire administration. The suggestion is made to limit recall time to within the past week for those with frequent sexual intercourse; for those with low levels of sexual activity, a month might be more suitable. A less well-known supervisor might have affected responses in the reinterviews. In conservative settings in Bangladesh, there may be a need to establish a good rapport. Heaping responses for the reinterview did not fit the expected pattern of quadrupling a week's response. Heaping occurred for numbers ending in "0" and "5." The recommendation is made for continued use of the question, because data are reasonably reliable, and this type of information can be useful in estimating monthly coital frequency and fecundability.