Table 3. Characteristics by self-reported ABO blood type among control participants, Shanghai Endometrial Cancer Study, 1997–2003.
| Characteristic | ABO blood type |
P | |||
| O (n = 358) | B (n = 252) | AB (n = 117) | A (n = 252) | ||
| Median age (25th, 75th percentile) | 55.1(49.4, 63.4) | 54.1(48.7, 60.2) | 54.3(49.0, 62.1) | 53.5(48.0, 60.9) | 0.04 |
| Education of college or above (%) | 25.5 | 30.3 | 31.9 | 28.8 | 0.45 |
| Postmenopausal status (%) | 66.8 | 61.5 | 65.8 | 58.7 | 0.19 |
| Time of menstruation (years, mean ± SD) | 30.8±5.5 | 31.3±4.4 | 31.3±4.7 | 30.1± 6.0 | 0.22 |
| No. of pregnancies (mean ± SD) | 2.9±1.4 | 2.6±1.3 | 2.9±1.3 | 2.7±1.3 | 0.09 |
| Family history of cancer (%) | 25.5 | 30.3 | 31.9 | 28.8 | |
| History of diabetes (%) | 8.1 | 6.4 | 4.3 | 7.5 | |
| Use of HRT (%) | 3.4 | 2.8 | 5.1 | 7.5 | |
| Use of oral contraceptives (%) | 29.1 | 25.4 | 16.2 | 24.6 | |
| Cigarette smoking (%) | 2.5 | 2.0 | 5.1 | 4.8 | |
| Alcohol drinking (%) | 5.3 | 4.0 | 8.6 | 5.6 | |
| BMI (mean ± SD) | 23.7±3.5 | 24.2±3.4 | 23.7±3.4 | 23.7±3.6 | |
P value for ANOVA test (continuous variables) or χ2 test (categorical variables).