Table 1

Demographic and social characteristics of women who underwent unilateral or bilateral oophorectomy and their matched referent women

CharacteristicUnilateral studyBilateral study
Unilateral oophorectomy
(n=570)
Referent women
(n=570)
p Value*Bilateral oophorectomy
(n=1653)
Referent women
(n=1653)
p Value*
n%n%n%n%
Age at surgery–†–†
 <309717.09717.0301.8301.8
  30–3410318.110318.11036.21036.2
  35–3914325.114325.121112.821112.8
  40–4516629.116629.168741.668741.6
  46–496110.76110.762237.662237.6
Calendar year of surgery–†–†
  1988–199213824.213824.231719.231719.2
  1993–199710919.110919.140624.640624.6
  1998–200214725.814725.855333.555333.5
  2003–200717630.917630.937722.837722.8
Years of education‡0.27<0.001
 <9142.5162.880.5311.9
  9–1217030.215126.851831.444727.6
  13–1631355.731155.289554.286153.2
 >166511.68515.122913.927917.2
Race0.54<0.001
  White53894.453593.9161197.5157095.0
  Black152.6162.8181.1291.8
  Asian122.1173.0181.1493.0
  Other50.920.460.450.3
Hispanic ethnicity1.000.65
  No55797.755797.7163398.8163098.6
  Yes132.3132.3201.2231.4
  • *The p values were calculated using Χ2 tests or Fisher’s exact tests.

  • †Not applicable because of the matching by age and calendar year.

  • ‡A total of 53 women had unknown education (8 unilateral oophorectomy, 7 unilateral referent, 3 bilateral oophorectomy and 35 bilateral referent) and were not included in the percentages.