Table 1.
Characteristics of women with and without premenstrual disorders (PMD)
| Population cohort | Sibling cohort a | |||
|---|---|---|---|---|
| Reference N (%) | PMD N (%) | Reference N (%) | PMD N (%) | |
| Total number | 1,472,310 | 18,628 | 631,236 | 7,674 |
| Year of birth | ||||
| 1960–1964 | 239,959 (16.3) | 4346 (23.3) | 80,813 (12.8) | 1471 (19.2) |
| 1965–1970 | 255,554 (17.4) | 5080 (27.3) | 111,933 (17.7) | 2142 (27.9) |
| 1970–1974 | 243,458 (16.5) | 4097 (22.0) | 112,549 (17.8) | 1837 (23.9) |
| 1975–1979 | 218,052 (14.8) | 2428 (13.0) | 103,626 (16.4) | 1097 (14.3) |
| 1980–1984 | 216,518 (14.7) | 1628 (8.7) | 106,187 (16.8) | 753 (9.8) |
| 1985–1990 | 298,769 (20.3) | 1049 (5.6) | 116,128 (18.4) | 374 (4.9) |
| Educational level | ||||
| Primary | 226,819 (15.4) | 2304 (12.4) | 104,799 (16.6) | 957 (12.5) |
| High school | 604,802 (41.1) | 9435 (50.6) | 262,378 (41.6) | 3910 (51.0) |
| College and beyond | 379,324 (25.8) | 6005 (32.2) | 166,447 (26.4) | 2508 (32.7) |
| Unknown | 261,365 (17.8) | 884 (4.7) | 97,612 (15.5) | 299 (3.9) |
| Region of residency | ||||
| South | 342,159 (23.2) | 3602 (19.3) | 150,946 (23.9) | 1514 (19.7) |
| Middle | 825,202 (56.0) | 11,293 (60.6) | 347,545 (55.1) | 4597 (59.9) |
| North | 304,949 (20.7) | 3733 (20.0) | 132,745 (21.0) | 1563 (20.4) |
| History of injury | ||||
| No | 1,327,241 (90.1) | 14,169 (76.1) | 571,236 (90.5) | 5870 (76.5) |
| Yes | 145,069 (9.9) | 4459 (23.9) | 60,000 (9.5) | 1804 (23.5) |
| PYs (%) | PYs (%) | PYs (%) | PYs (%) | |
| Psychiatric comorbiditiesb | ||||
| No | 13,820,488 (95.6) | 83,418 (89.3) | 6,050,657 (95.9) | 34,195 (89.7) |
| Yes | 636,709 (4.4) | 10,005 (10.7) | 261,787 (4.1) | 3932 (10.3) |
N number, PYs person-years
aSibling cohort was restricted to women with at least one identifiable full sister in the population cohort
bPsychiatric disorder was considered as time-varying, i.e., person-years from the cohort entry if any diagnosis of psychiatric disorders occurred before cohort entry, or person-years from the date of diagnosis if any diagnosis of psychiatric disorders occurred during the follow-up