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Table 1 Patient and tumor characteristics in NHS, NHSII, and NEC studies (n = 234)

From: Lifetime ovulatory years and ovarian cancer gene expression profiles

Study, n (%)

 NEC

83 (35)

 NHS

108 (46)

 NHSII

43 (18)

Age at diagnosis, years, mean (SD)

63 (10)

Calendar year at diagnosis, median

2004

Menopausal status, n (%)

 Premenopausal

51 (22)

 Postmenopausal

183 (78)

Age at menarche, years, mean (SD)

13 (1)

Oral contraceptive use, years, mean (SD)

3 (4)

Parity, mean (SD)

2 (2)

Age at menopause, years, mean (SD)a

50 (3)

Histotype, n (%)

 High grade serous/poorly differentiated

211 (90)

 High grade endometrioid

22 (9)

 Brenner

1 (1)

Stage, n (%)

 I

35 (15)

 II

22 (9)

 III

156 (67)

 IV

19 (8)

 Unknown

2 (1)

Ovulatory years, mean (SD)

36 (6)

  1. Abbreviations: NHS Nurses’ Health Study, NHSII Nurses’ Health Study II, NEC New England Case–Control Study, SD Standard Deviation
  2. aAmong postmenopausal women