Table 2.

Distribution of descriptive characteristics by case and control subjects (N = 4,323)

CharacteristicCases (n = 393)Controls (n = 3,930)
n%n%
Age at index date, y
 50–59491281722
 60–69117301,04227
 70–75120311,14029
 ≥801072790123
County
 Aarhus142361,42036
 North Jutland165421,65042
 Viborg511351013
 Ringkøbing358.93508.9
Year of birth
 Before 1920772066717
 1920–1939226581,99751
 1940–195990231,26632
Age at first birth, y
 Nulliparous128331,13429
 <20307.63289.4
 20–29127321,50339
 ≥30741954914
Parity
 Nulliparous128331,13429
 1 child822179820
 2 children95241,00726
 3 children581561716
 ≥4 children307.63749.5
Postmenopausal hormone replacement therapy922393724
Polycystic ovarian syndrome0-40.1
Diabetes complications182461,79446
Time since diabetes diagnosis, y
 <5172441,72444
 5–101062796224
 ≥10115291,24432
Clinical obesity501362816
Antidiabetic medication
 Metformin usersb96241,15429
 Nonmetformin usersb297762,77671
  • aMetformin users were defined as women who were prescribed metformin for a minimum of 1-year duration and include women who used metformin and switched to other medications as long as they used metformin for at least 1 year.

  • bNonmetformin users were defined as women not prescribed antidiabetic medications, women who were prescribed other antidiabetic medications, and women who did not use metformin for at least 1-year duration.