Fertility and sterility · 2010
Serum inhibin-b in fertile men is strongly correlated with low but not high sperm counts: a coordinated study of 1,797 European and US men.
Сравнительное исследованиеОценочное исследованиеСтатьяМногоцентровое исследованиеПоддержка NIH: внешняя программаПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод пока не подготовлен
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Jørgensen Niels, Liu Fan, Andersson Anna-Maria, Vierula Matti, Irvine D Stewart, Auger Jacques, Brazil Charlene K, Drobnis Erma Z, Jensen Tina K, Jouannet Pierre, Overstreet James W, Redmon J Bruce, Sparks Amy, Toppari Jorma, Wang Christina, Skakkebæk Niels E, Swan Shanna H
Аннотация
OBJECTIVE: To describe associations between serum inhibin-b and sperm counts, adjusted for effect of time of blood sampling, in larger cohorts than have been previously reported.
DESIGN: Cross-sectional studies of spermatogenesis markers.
SETTING: Four European and four US centers.
PATIENT(S): Fertile men (1,797) were included and examined from October 1996-February 2005.
INTERVENTION(S): The study was observational and therefore without any intervention.
MAIN OUTCOME MEASURE(S): Associations between inhibin-b and semen variables controlled for time of blood sampling and other covariates.
RESULT(S): Inhibin-b decreased about 2.00% per hour from 8 am-12 pm and then about 3.25% per hour from 12 pm-4 pm. There was a strong positive association between inhibin-b levels less than 150 pg/mL and both sperm concentration and total sperm count (slopes of the regression lines were β=0.011 and β=0.013 for natural logarithm-transformed sperm concentration and total sperm count, respectively). For inhibin-b levels of 150-300 pg/mL the associations were not as steep (β=0.002), but still significant. For inhibin-b levels more than 300 pg/mL there was little association to the sperm counts. Neither sperm motility nor morphology was significantly related to inhibin-b level in any group.
CONCLUSION(S): Serum inhibin-b levels decrease nonlinearly during the daytime, and are positively correlated with sperm counts, but the predictive power is best when inhibin-b is low.
DESIGN: Cross-sectional studies of spermatogenesis markers.
SETTING: Four European and four US centers.
PATIENT(S): Fertile men (1,797) were included and examined from October 1996-February 2005.
INTERVENTION(S): The study was observational and therefore without any intervention.
MAIN OUTCOME MEASURE(S): Associations between inhibin-b and semen variables controlled for time of blood sampling and other covariates.
RESULT(S): Inhibin-b decreased about 2.00% per hour from 8 am-12 pm and then about 3.25% per hour from 12 pm-4 pm. There was a strong positive association between inhibin-b levels less than 150 pg/mL and both sperm concentration and total sperm count (slopes of the regression lines were β=0.011 and β=0.013 for natural logarithm-transformed sperm concentration and total sperm count, respectively). For inhibin-b levels of 150-300 pg/mL the associations were not as steep (β=0.002), but still significant. For inhibin-b levels more than 300 pg/mL there was little association to the sperm counts. Neither sperm motility nor morphology was significantly related to inhibin-b level in any group.
CONCLUSION(S): Serum inhibin-b levels decrease nonlinearly during the daytime, and are positively correlated with sperm counts, but the predictive power is best when inhibin-b is low.