Table 1 Baseline characteristics of young and middle-aged Korean workers in 2007 according to premenstrual syndrome during follow-up period
Total participants, n (%) | Premenstrual syndrome, n (%) | P-value | ||
|---|---|---|---|---|
No | Yes | |||
Total participants | 121,024 (100.0) | 112,521 (100.0) | 8,503 (100.0) | |
Socioeconomic status | ||||
Age | < 0.0001 | |||
15–19 | 1,459 (1.2) | 1,279 (1.1) | 180 (2.1) | |
20–29 | 64,541 (53.3) | 58,788 (52.2) | 5,753 (67.7) | |
30–39 | 55,024 (45.5) | 52,454 (46.6) | 2,570 (30.2) | |
Household income level | < 0.0001 | |||
Low | 47,865 (39.5) | 44,522 (39.6) | 3,343 (39.3) | |
Middle–low | 32,578 (26.9) | 30,119 (28.9) | 2,459 (28.9) | |
Middle–high | 24,661 (20.4) | 22,840 (21.4) | 1,821 (21.4) | |
High | 15,920 (13.2) | 15,040 (10.3) | 880 (10.3) | |
Occupational characteristics | ||||
Type of work | < 0.0001 | |||
Office | 65,236 (53.9) | 60,701 (53.9) | 4,535 (53.3) | |
Manual | 37,003 (30.6) | 34,219 (30.4) | 2,784 (32.7) | |
Other | 18,785 (15.5) | 17,601 (15.6) | 1,184 (13.9) | |
Duration of work (month) | 0.0003 | |||
< 6 | 15,033 (12.4) | 13,931 (12.4) | 1,102 (13.0) | |
7–12 | 27,739 (22.9) | 25,655 (22.8) | 2,084 (24.5) | |
> 12 | 78,252 (64.7) | 72,935 (64.8) | 5,317 (62.5) | |