Table 1. Age and age-standardised characteristics by postmenopausal hormone use and hormone type in the Nurses' Health Study, 1992a.
|
PMH status
|
Current PMH users
|
||||
|---|---|---|---|---|---|
| Never user (n=20 853) | Past user (n=10 053) | Current user (n=16831) | Estrogen only (n=4315) | Estrogen+Progestin (n=7394) | |
| Age, mean, years | 61 | 64 | 60 | 62 | 58 |
| Duration of PMH use, mean, years | 0 | 3 | 7 | 9 | 6 |
| Duration of OC use (%) | |||||
| Never | 66 | 58 | 55 | 54 | 52 |
| < 3 years | 18 | 23 | 22 | 23 | 22 |
| ⩾3 years | 17 | 20 | 23 | 23 | 26 |
| Parity | |||||
| Parous women (%) | 94 | 93 | 93 | 94 | 93 |
| Mean no. of children (among parous) | 3 | 3 | 3 | 3 | 3 |
| Familyb history of ovarian cancer (%) | 3 | 3 | 2 | 3 | 3 |
| Had a simple hysterectomy (%) | 5 | 12 | 19 | 47 | 2 |
| Had a tubal ligation (%) | 13 | 14 | 14 | 10 | 17 |
| Age at menarche, mean, years | 13 | 13 | 13 | 13 | 13 |
| Age at natural menopause, mean, years | 50 | 49 | 50 | 49 | 50 |
Abbreviations: PMH, postmenopausal hormone; OC, oral contraceptive.
a
Characteristics are presented for the 47 737 nurses who met the study eligibility criteria in 1992; all factors except age were age-standardised in 5-year intervals.
b
Mother or sister had ovarian cancer according to nurse's response to questionnaire.