Table 1 The distribution of studied women (born between the 1920s and 1980s) by birth cohort and menopausal status
Birth cohort | Number | Percentage | Menopausal status | Number | Percentage |
|---|---|---|---|---|---|
1920 (1920–1929) | 320 | 16.6 | Premenopausal | 475 | 31.2 |
1930 (1930–1939) | 347 | 18.0 | Early perimenopausal | 53 | 3.5 |
1940 (1940–1949) | 275 | 14.2 | Late perimenopausal | 51 | 3.4 |
1950 (1950–1959) | 357 | 18.5 | Postmenopausal | 941 | 61.9 |
1960 (1960–1969) | 256 | 13.3 | Hyster- or ovariectomized | 401 | – |
1970 (1970–1979) | 192 | 9.9 | Unknown | 11 | – |
1980 (1980–1989) | 185 | 9.6 |  |  |  |
Total | 1932 | 100.0 | Total | 1932 | 100.0 |