Table 1.
Baseline Characteristics of Study Participants and Excluded Cases, Shanghai, China, 2002-2006.
| Characteristic | Study cohort (n = 4,948) | Excluded casesa (n = 94) | P-value |
|---|---|---|---|
| Median age at diagnosis, (IQR) b | 51.1 (46.4 - 60.5) | 55.2 (47.5-66.9) | <0.02 |
| Monthly income (yuan) (%) | |||
| <500 | 0.97 | ||
| 500-699 | 11.1 | 9.6 | |
| 700-999 | 16.5 | 14.9 | |
| 1000-1999 | 29.4 | 32.0 | |
| >2000 | 31.0 | 32.0 | |
| 12.0 | 11.7 | ||
| Education level (%) | 0.20 | ||
| <High school | 46.4 | 45.7 | |
| High school | 37.6 | 37.2 | |
| >High school | 16.0 | 17.1 | |
| Received chemotherapy (%) | 91.2 | 89.4 | 0.47 |
| Received radiotherapy (%) | 32.1 | 33.0 | 0.83 |
aExcluded cases represent women enrolled in the Shanghai Breast Cancer Survival Study who had missing patient questionnaire data.
bIQR: Inter-quartile range.