Curtis S L
DHS Program, Macro International Inc., Calverton, MD 20705, USA.
Demography. 1996 Feb;33(1):24-34.
Redundant use of contraception occurs when periods of contraceptive use overlap with periods of reduced fecundity, and will downwardly bias estimates of contraceptive failure rates. This paper investigates this bias using calendar data from the Demographic and Health Surveys. The paper presents unadjusted and adjusted 12-month failure rates for each of nine countries. The impact of redundant use on failure rates is generally modest. It tends to be greater in Indonesia, however, where both the incidence and the duration of overlap are relatively large.
当避孕期与生育力降低期重叠时，就会出现避孕措施的重复使用情况，这会使避孕失败率的估计值产生向下偏差。本文利用人口与健康调查的日历数据对这种偏差进行了调查。文章给出了九个国家中每个国家未经调整和调整后的12个月失败率。重复使用对失败率的影响通常较小。然而，在印度尼西亚，这种影响往往更大，因为重叠的发生率和持续时间都相对较高。
