Table 1 Characteristics of cases and controls
| Â | Cases (n = 224) | Controls (n = 224) |
|---|---|---|
Age (years), mean (SD) | 42.2 (6.2) | 42.4 (6.2) |
Marital status | ||
   Living alone | 24 (10.7) | 30 (13.4) |
   Living with spouse/partner | 176 (78.6) | 168 (75) |
   Other | 24 (10.7) | 26 (11.6) |
Children | ||
   Having at least 1 child | 192 (85.7) | 172 (76.8) |
   Having no child | 32 (14.3) | 52 (23.2) |
Employment status | ||
   Full-time/part-time work | 166 (74.1) | 142 (63.4) |
   Unemployed | 36 (16.1) | 58 (25.9) |
   Retired | 22 (9.8) | 24 (10.7) |
Family income (RMB per year) | ||
   <50,000 | 28 (12.5) | 36 (16.1) |
   50,000-100,000 | 112 (50.0) | 124 (55.4) |
   >100,000 | 84 (37.5) | 64 (28.6) |
Health insurance | ||
   Mainstream insurance | 138 (61.6) | 102 (45.5) |
   Other insurance | 12 (5.4) | 8 (3.6) |
   No insurance | 74 (33.0) | 114 (50.9) |
Education | ||
   ≤high school | 78 (34.8) | 98 (43.8) |
   College | 100 (44.6) | 95 (42.4) |
   Graduate school | 46 (20.5) | 31 (13.8) |
Previous diagnosis of uterine fibroids | ||
   Within 1 year | 160 (71.4) | 8 (3.6) |
   1 year before | 64 (28.6) | 14 (6.3) |
   No diagnosis | 0 (0) | 202 (90.2) |
Self-rated uterine fibroids related symptom score, mean (SD) | 1.8 (1.6) | 1.4 (1.2) |
   Mild | 136 (60.7) | 168 (75.0) |
   Moderate | 62 (27.7) | 43 (19.2) |
   Severe | 26 (11.6) | 13 (5.8) |
Annual health examination | ||
   Having at least 1 health examination | 138 (61.6) | 62 (27.7) |
   Not having health examination | 86 (38.4) | 162 (72.3) |