Table 1.
Comparison of cases and controls with genotyping data on demographic characteristics and selected risk factors for endometrial cancer, the Shanghai Endometrial Cancer Study, 1997–2003.
| Participant Characteristics | Cases (n=1028) | Controls (n=1003) | P-valuea |
|---|---|---|---|
| Age (years, x̄ ± sd) | 54.3 ± 8.5 | 54.4 ± 8.5 | 0.87 |
| ≥ Middle school education (%) | 78.3 | 78.0 | 0.85 |
| Regular smoker (%) | 3.1 | 3.6 | 0.55 |
| Regular alcohol consumption (%) | 3.1 | 5.3 | 0.01 |
| First degree relative with cancer (%) | 35.7 | 29.6 | <0.01 |
| Age at menarche (x̄ ± sd) | 14.5 ± 1.7 | 14.8 ± 1.8 | <0.01 |
| Postmenopausal (%) | 56.8 | 61.5 | 0.03 |
| Age at menopauseb (x̄ ± sd) | 50.3 ± 3.6 | 49.0 ± 3.6 | <0.01 |
| Years of menstruation (x̄ ± sd) | 32.8 ± 4.9 | 30.7 ± 5.3 | <0.01 |
| Number of live births (x̄ ± sd) | 2.6 ± 1.4 | 2.8 ± 1.3 | <0.01 |
| Ever used oral contraceptives (%) | 18.0 | 25.3 | <0.01 |
| Ever used hormone replacement therapy (%) | 4.8 | 4.4 | 0.68 |
| Diagnosis of diabetes (%) | 15.1 | 6.9 | <0.01 |
| Body mass index (x̄ ± sd) | 25.8 ± 4.1 | 23.8 ± 3.5 | <0.01 |
| Waist-to-hip ratio (x̄ ± sd) | 0.84 ± 0.05 | 0.82 ± 0.06 | <0.01 |
| Engaged in regular physical activity (%) | 28.2 | 33.9 | <0.01 |
a
For χ2 test (categorical variables) or non parameter Wilcoxon test (continuous variables).
b
Only among postmenopausal women.