TY - JOUR
T1 - Interobserver variation in estimation of day of conception intercouse using selected natural family planning charts
AU - Kambic, R.
AU - Gray, R. H.
N1 - Funding Information:
Received May 3, 1988; revised and accepted November 17, 1988. * Supported by The Institute for International Studies in Natural Family Planning, Georgetown University, under cooperative agreement with The United States Agency for International Development (AID) (DPE-3040-A-00-5064-00) through The University of Tennessee. t The views expressed by the authors do not necessarily reflect the views of AID, Georgetown University, or The University of Tennessee. t Reprint requests: Robert Kambic, M.S.H., Department of Population Dynamics, The Johns Hopkins University School of Hygiene and Public Health, 615 North Wolfe Street, Baltimore, Maryland 21205.
PY - 1989
Y1 - 1989
N2 - In order to study outcome of pregnancy related to timing of conception it is necessary to have both markers of ovulation and records of intercourse. Natural family planning (NFP) charts where the woman records basal body temperature (BBT) and mucus signs are ideal for this purpose. Much work has been done relating timing of BBT and mucus signs to ovulation, but very little work has been done to examine interobserver agreement on the interpretation of these signs. Four NFP experts examined 28 NFP pregnancy charts to determine the BBT rise, the mucus peak, and two most likely days of conception intercourse. The charts were selected because they provided difficulties in interpretation. The reviewers were able to agree on the most probable day of conception intercourse in 96.4% of cases, on the mucus peak in 74.1% of cases, and on the interval between the most probable conception intercourse and mucus peak in 70.4% of cases. There was poor agreement on the first day of the BBT rise (38.5%). The authors conclude that in selected difficult NFP charts, the mucus peak is a more valid indirect measure of ovulation both because it is subject to less interobserver variation and because it more closely approximates the timing of ovulation.
AB - In order to study outcome of pregnancy related to timing of conception it is necessary to have both markers of ovulation and records of intercourse. Natural family planning (NFP) charts where the woman records basal body temperature (BBT) and mucus signs are ideal for this purpose. Much work has been done relating timing of BBT and mucus signs to ovulation, but very little work has been done to examine interobserver agreement on the interpretation of these signs. Four NFP experts examined 28 NFP pregnancy charts to determine the BBT rise, the mucus peak, and two most likely days of conception intercourse. The charts were selected because they provided difficulties in interpretation. The reviewers were able to agree on the most probable day of conception intercourse in 96.4% of cases, on the mucus peak in 74.1% of cases, and on the interval between the most probable conception intercourse and mucus peak in 70.4% of cases. There was poor agreement on the first day of the BBT rise (38.5%). The authors conclude that in selected difficult NFP charts, the mucus peak is a more valid indirect measure of ovulation both because it is subject to less interobserver variation and because it more closely approximates the timing of ovulation.
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U2 - 10.1016/s0015-0282(16)60548-4
DO - 10.1016/s0015-0282(16)60548-4
M3 - Article
C2 - 2920843
AN - SCOPUS:0024519880
SN - 0015-0282
VL - 51
SP - 430
EP - 434
JO - Fertility and sterility
JF - Fertility and sterility
IS - 3
ER -