Time to pregnancy and semen parameters: a cross-sectional study among fertile couples from four European cities
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Time to pregnancy and semen parameters : a cross-sectional study among fertile couples from four European cities. / Slama, Remy; Eustache, Florence; Ducot, B.; Jensen, Tina Kold; Jørgensen, Niels; Horte, Antero; Irvine, S.; Suominen, J.; Andersen, A.G.; Auger, J.; Vierula, Matti; Toppari, J.; Andersen, Anders Nyboe; Keiding, Niels; Skakkebæk, Niels Erik; Spira, Alfred; Jouannet, P.
In: Human Reproduction, Vol. 17, No. 2, 2002, p. 503-515.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Time to pregnancy and semen parameters
T2 - a cross-sectional study among fertile couples from four European cities
AU - Slama, Remy
AU - Eustache, Florence
AU - Ducot, B.
AU - Jensen, Tina Kold
AU - Jørgensen, Niels
AU - Horte, Antero
AU - Irvine, S.
AU - Suominen, J.
AU - Andersen, A.G.
AU - Auger, J.
AU - Vierula, Matti
AU - Toppari, J.
AU - Andersen, Anders Nyboe
AU - Keiding, Niels
AU - Skakkebæk, Niels Erik
AU - Spira, Alfred
AU - Jouannet, P.
PY - 2002
Y1 - 2002
N2 - Background: In fertile populations, little is known about the association between semen parameters and time to pregnancy (TTP). Methods: Pregnant women from Copenhagen, Edinburgh, Paris and Turku who conceived without medical intervention were asked for their TTP (942 couples), and their partners provided a semen sample. The proportion of morphologically normal sperm and the multiple anomalies index (MAI, ratio of the total number of anomalies to the number of abnormal sperm) were centrally estimated. We estimated rate ratios for the occurrence of a pregnancy by a discrete survival model, adjusted for sexual activity and female factors affecting fecundity. Results: Increasing sperm concentration influenced TTP up to 55 × 106/ml. The proportion of morphologically normal sperm influenced TTP up to 39% according to David's criteria, and this association held among the subjects with a sperm concentration >55 × 106/ml. For strict criteria, the threshold value was 19% normal sperm. An increase of 0.5 in MAI was associated with an adjusted rate ratio for the occurrence of a pregnancy of 0.68 (95% confidence interval: 0.54-0.85). Conclusions: These results highlight the importance of sperm morphology parameters and indicate that the effect of proportion of normal sperm on TTP may be independent of sperm concentration.
AB - Background: In fertile populations, little is known about the association between semen parameters and time to pregnancy (TTP). Methods: Pregnant women from Copenhagen, Edinburgh, Paris and Turku who conceived without medical intervention were asked for their TTP (942 couples), and their partners provided a semen sample. The proportion of morphologically normal sperm and the multiple anomalies index (MAI, ratio of the total number of anomalies to the number of abnormal sperm) were centrally estimated. We estimated rate ratios for the occurrence of a pregnancy by a discrete survival model, adjusted for sexual activity and female factors affecting fecundity. Results: Increasing sperm concentration influenced TTP up to 55 × 106/ml. The proportion of morphologically normal sperm influenced TTP up to 39% according to David's criteria, and this association held among the subjects with a sperm concentration >55 × 106/ml. For strict criteria, the threshold value was 19% normal sperm. An increase of 0.5 in MAI was associated with an adjusted rate ratio for the occurrence of a pregnancy of 0.68 (95% confidence interval: 0.54-0.85). Conclusions: These results highlight the importance of sperm morphology parameters and indicate that the effect of proportion of normal sperm on TTP may be independent of sperm concentration.
U2 - 10.1093/humrep/17.2.503
DO - 10.1093/humrep/17.2.503
M3 - Journal article
VL - 17
SP - 503
EP - 515
JO - Human Reproduction
JF - Human Reproduction
SN - 0268-1161
IS - 2
ER -
ID: 134389