Jørgen H Olsen

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The Danish National Hospital Register (LPR) has collected nationwide data on all somatic hospital admissions since 1977, and since 1995 data on outpatients and emergency patients have been included as well. Numerous research projects have been undertaken in the national Danish context as well as in collaboration with international teams, and the LPR is(More)
BACKGROUND Case-control studies and a voluntary-based follow-up study have suggested that repeated screening with faecal-occult-blood (FOB) tests can lead to a reduction in mortality from colorectal cancer (CRC). The aim of this randomised study was to compare mortality rates after FOB tests every 2 years during a 10-year period with those of unscreened(More)
BACKGROUND Diabetes has been associated with an increased risk of several cancers, notably cancers of the pancreas, liver, endometrium, and kidney. Since most previous studies have involved a limited sample size or focused on specific cancer sites, we conducted a comprehensive assessment of the risk of cancer in a nationwide cohort of diabetics in Denmark.(More)
BACKGROUND It is well known that the time from conception to early childhood has importance for health conditions that reach into later stages of life. Recent research supports this view, and diseases such as cardiovascular morbidity, cancer, mental illnesses, asthma, and allergy may all have component causes that act early in life. Exposures in this(More)
BACKGROUND The Danish Medical Birth Registry (MBR) was established in 1968 and has been computerized since 1973. The primary purpose of the registration is to monitor the health of the newborns and of the quality of the antenatal and delivery care services, but the registry is increasingly being used in research. Major changes in registration have taken(More)
OBJECTIVE To estimate the association between maternal age and fetal death (spontaneous abortion, ectopic pregnancy, stillbirth), taking into account a woman's reproductive history. DESIGN Prospective register linkage study. SUBJECTS All women with a reproductive outcome (live birth, stillbirth, spontaneous abortion leading to admission to hospital,(More)
A cohort of 43,965 obese persons was accrued on the basis of discharge registrations from Danish hospitals, and incidence of cancer in the cohort was compared to that in the Danish population as a whole using indirect standardisation for age and period. Increased incidence was observed for cancer of the uterine corpus independently of age [114 cases,(More)
BACKGROUND Semen analysis is part of the routine assessment of infertile couples. WHO defines a sperm concentration above 20x10(6) per mL seminal fluid as normal. We studied the association between semen quality and the probability of conception in a single menstrual cycle in Danish couples with no previous reproductive experience. METHODS In 1992-94, we(More)
BACKGROUND Selective serotonin reuptake inhibitors (SSRIs) have been suspected of increasing the risk of bleeding. We examined the risk of upper gastrointestinal tract (GI) bleeding with use of antidepressant medication. METHODS All users of antidepressants in the county of North Jutland, Denmark, from January 1, 1991, to December 31, 1995, were(More)
BACKGROUND Little is known about the prognosis of cancer discovered during or after an episode of venous thromboembolism. METHODS We linked the Danish National Registry of Patients, the Danish Cancer Registry, and the Danish Mortality Files to obtain data on the survival of patients who received a diagnosis of cancer at the same time as or after an(More)