Morten Jensen's Publications List

Age at cryptorchidism diagnosis and orchiopexy in Denmark: a population based study of 508,964 boys born from 1995 to 2009.

2011-11-09T13:18:33Z

Early treatment for cryptorchidism may be necessary to preserve fertility. International guidelines now recommend that congenital cryptorchidism be treated with orchiopexy before age 1 year. Acquired cryptorchidism should be treated at presentation. To our knowledge the rate of adherence to these guidelines in recent years is unknown. Thus, we present data on age at cryptorchidism diagnosis and or...

Morten Søndergaard Jensen, Lars Henning Olsen, Ane Marie Thulstrup, Jens Peter Bonde, Jørn Olsen, Tine Brink Henriksen (2011) J Urol 186: 4 Suppl 1595-1600

Comment on maternal alcohol consumption--Re: "Cryptorchidism and hypospadias as a sign of testicular dysgenesis syndrome: environmental connection".

2011-05-04T20:48:59Z

Morten Søndergaard Jensen, Jens Peter Bonde, Jørn Olsen (2011) Birth Defects Res A Clin Mol Teratol 91: 2

Does breastfeeding influence future sperm quality and reproductive hormones?

2011-05-04T20:48:59Z

No human study has investigated the possible impact of breastfeeding on semen quality and levels of reproductive hormones, but a recent study of another hypothesis indicated an association with oligozoospermia. We investigated the association between breastfeeding, semen quality and levels of reproductive hormones. From a Danish pregnancy cohort established in 1984-1987, 347 sons were selected acc...

J M Laustsen, M S Jensen, A M Thulstrup, P Gabel, G Toft, J P Bonde, J Olsen, C H Ramlau-Hansen (2011) Int J Androl 34: 2 165-172

Parental occupational exposure to endocrine disrupting chemicals and male genital malformations: a study in the Danish National Birth Cohort study.

2011-05-04T20:48:59Z

Sex hormones closely regulate development of the male genital organs during fetal life. The hypothesis that xenobiotics may disrupt endogenous hormonal signalling has received considerable scientific attention, but human evidence is scarce.

María M Morales-Suárez-Varela, Gunnar V Toft, Morten S Jensen, Cecilia Ramlau-Hansen, Linda Kaerlev, Ane-Marie Thulstrup, Agustín Llopis-González, Jørn Olsen, Jens P Bonde (2011) Environ Health 10: 1

Analgesics during pregnancy and cryptorchidism: additional analyses.

2011-11-09T13:18:33Z

Morten Søndergaard Jensen, Tine Brink Henriksen, Cristina Rebordosa, Ane Marie Thulstrup, Gunnar Toft, Henrik Toft Sørensen, Jens Peter Bonde, Jørn Olsen (2011) Epidemiology 22: 4 610-612

Maternal use of acetaminophen, ibuprofen, and acetylsalicylic acid during pregnancy and risk of cryptorchidism.

2011-05-04T20:48:59Z

Cyclooxygenase (COX) inhibitors-acetaminophen, ibuprofen and acetylsalicylic acid-have endocrine-disruptive properties in the rainbow trout. In humans, aspirin blocks the androgen response to human chorionic gonadotropin (hCG), and, because hCG-stimulated androgen production in utero is crucial for normal testicular descent, exposure to COX inhibitors at vulnerable times during gestation may impai...

Morten Søndergaard Jensen, Cristina Rebordosa, Ane Marie Thulstrup, Gunnar Toft, Henrik Toft Sørensen, Jens Peter Bonde, Tine Brink Henriksen, Jørn Olsen (2010) Epidemiology 21: 6 779-785

Maternal alcohol consumption during pregnancy and semen quality in the male offspring: two decades of follow-up.

2011-05-04T20:48:59Z

Concurrent alcohol exposure has been associated with reduced fecundity, but no studies have estimated the effect of prenatal alcohol exposure on male fecundity. The aim of this study was to investigate the association between maternal alcohol consumption during pregnancy, semen quality and levels of reproductive hormones in young, adult men.

C H Ramlau-Hansen, G Toft, M S Jensen, K Strandberg-Larsen, M L Hansen, J Olsen (2010) Hum Reprod 25: 9 2340-2345

Alcohol binge drinking during pregnancy and cryptorchidism.

2011-05-04T20:48:59Z

Recent studies have suggested gestational weeks 8-14 as a time window of particular importance to the intrauterine development of the male genitalia, and prenatal exposure to alcohol is under suspicion as a risk factor for cryptorchidism. We examined if prenatal exposure to alcohol, and especially binge drinking, during the suggested programming window is associated with an increased risk of crypt...

Katrine Strandberg-Larsen, Morten Søndergaard Jensen, Cecilia Høst Ramlau-Hansen, Morten Grønbaek, Jørn Olsen (2009) Hum Reprod 24: 12 3211-3219

Cryptorchidism concordance in monozygotic and dizygotic twin brothers, full brothers, and half-brothers.

2008-12-03T19:21:47Z

OBJECTIVE: To study concordance rates of cryptorchidism (undescended testis) in pairs of boys with varying family structure, to evaluate the risk contribution from the intrauterine environment and genetic factors. DESIGN: Population based study of 1,024,500 Danish boys born from January 1, 1973 to December 31, 2004. Classic twin method and computerized square dance design. SETTING: Hospitals and o...

Jensen, Toft, Thulstrup, Henriksen, Olsen, Christensen, Bonde (2008) Fertil Steril :

Prenatal alcohol exposure and cryptorchidism.

2008-04-23T13:35:45Z

AIM: A recently published study reported markedly increased risk of cryptorchidism among boys whose mothers had an average gestational alcohol intake of five or more drinks per week. The aim of this study is to follow up on this finding by estimating the association between prenatal alcohol exposure and persistent cryptorchidism. METHODS: We used prospectively collected information on prenatal exp...

M S Jensen, J P Bonde, J Olsen (2007) Acta Paediatr 96: 11 1681-1685

Cryptorchidism according to maternal gestational smoking.

2008-04-23T13:35:45Z

BACKGROUND: It has been suggested that maternal smoking during pregnancy is a risk factor for low sperm counts and testicular cancer in the offspring. Cryptorchidism is associated with both of these disorders and might share causal mechanisms. METHODS: We used prospective information on prenatal exposures and obstetric information on the birth of 5716 boys, collected from 1984 to 1987. During the ...

Morten Søndergaard Jensen, Gunnar Toft, Ane Marie Thulstrup, Jens Peter Bonde, Jørn Olsen (2007) Epidemiology 18: 2 220-225

Is smoking a risk factor for decreased semen quality? A cross-sectional analysis.

2008-04-23T13:35:45Z

BACKGROUND: Previous studies suggest a deleterious effect of cigarette smoking on semen quality, but their results have not been consistent. We studied the association between current smoking and semen characteristics and hormonal levels in a large group of healthy men. METHODS: From 1987 to 2004, seven separate occupational or environmental semen quality studies were co-ordinated by our departmen...

C H Ramlau-Hansen, A M Thulstrup, A S Aggerholm, M S Jensen, G Toft, J P Bonde (2007) Hum Reprod 22: 1 188-196

Fecundability according to male serum inhibin B--a prospective study among first pregnancy planners.

2008-04-23T13:35:45Z

BACKGROUND: New biological markers of male fecundity are needed for use in large-scale epidemiological studies. We studied the association between male inhibin B and fecundability. METHODS: Four hundred and thirty Danish couples without previous reproductive experience were followed from termination of contraception until pregnancy or for a maximum of six menstrual cycles. At enrolment we obtained...

L M Mabeck, M S Jensen, G Toft, M Thulstrup, M Andersson, T K Jensen, A Giwercman, J Olsen, J P Bonde (2005) Hum Reprod 20: 10 2909-2915

Lower sperm counts following prenatal tobacco exposure.

2008-04-23T13:35:45Z

BACKGROUND: Recent findings have indicated that prenatal exposure to tobacco smoke may cause lower sperm concentration in ejaculates of adult men. To extend the research on this hypothesis we investigated the dose-dependency of the association, controlling for other prenatal exposures. METHODS: From 1987 to 1996, four separate occupational semen studies were conducted at three centres in Denmark. ...

M S Jensen, L M Mabeck, G Toft, A M Thulstrup, J P Bonde (2005) Hum Reprod 20: 9 2559-2566