Table 1

Descriptive characteristics of ovarian cancer cases and hospital controls—RPCI, Buffalo, NY 1982–1996

Cases (n = 547)Controls (n = 1094)P
Agea54.7 (13.7)54.5 (13.7)nsb
Educationc
 Up to high school286 (52.5)608 (55.6)
 College259 (47.5)486 (44.4)ns
Tubal ligationc
 Yes69 (12.7)199 (18.3)
 No475 (87.3)887 (81.7)<0.05
Oral contraceptive usec
 Ever168 (30.8)358 (33.0)
 Never377 (69.2)728 (67.0)ns
Regularity of mensesc
 Regular478 (87.7)902 (83.1)<0.05
 Irregular67 (12.3)183 (16.9)
Age at menarchea13.7 (9.2)13.2 (6.7)ns
Parity
 Nulliparous131 (24.3)186 (17.3)
 1–2191 (35.5)373 (34.7)
 3–4175 (32.5)379 (35.3)
 5+41 (7.6)137 (12.7)<0.01
Age at first pregnancya,d23.7 (4.5)22.3 (5.0)<0.05
Family history of ovarian cancerc
 No504 (92.1)1060 (96.9)<0.05
 Yes43 (7.9)34 (3.1)
  • a Mean (SD).

  • b ns, not significant.

  • c n (%).

  • d Among parous women.