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Table 1 Characteristics of the study participants, showing mean and standard deviation (SD) for continuous characteristics and frequency and percentage for categorical characteristics

From: Endometriosis as a risk factor for ovarian or endometrial cancer — results of a hospital-based case–control study

Characteristic Controls (n = 1016) Cases (n = 289) Ovarian cancer cases (n = 165) Endometrial cancer cases (n = 131)a
Mean or n SD or % Mean or n SD or % Mean or n SD or % Mean or n SD or %
Age [years] 60.9 9.3 62.1 11.1 59.5 11.1 65.6 10.5
Body mass index [kg/m2] 25.5 4.3 27 5.8 26 4.7 28.3 6.9
Self-reported endometriosis
 No 995 97.9 275 95.2 158 95.8 124 94.7
 Yes 21 2.1 14 4.8 7 4.2 7 5.3
Oral contraceptive use
 No 275 27.1 141 48.8 72 43.6 71 54.2
 Yes 741 72.9 148 51.2 93 56.4 60 45.8
Pregnancies (n)
 0 121 11.9 41 14.2 14 8.5 27 20.6
 1 165 16.2 62 21.5 31 18.8 32 24.4
 2 373 36.7 100 34.6 66 40.0 37 28.2
 3 219 21.6 52 18.0 35 21.2 19 14.5
 4+ 138 13.6 34 11.8 19 11.5 16 12.2
  1. aSummed up numbers of ovarian and endometrial cancer cases is larger than 289, because there were cases with both ovarian and endometrial cancer