Table 1.
Characteristics of subjects between case and control groups1
| Characteristic | Case | Control 1 | Control 2 | P-value |
| Age (mean ± SD, yr) | 53.3 ± 9.0 | 54.3 ± 8.3 | 52.7 ± 9.7 | 0.23 |
| Gender | ||||
| Male | 47 | 70 | 98 | |
| Female | 39 | 94 | 115 | 0.19 |
| Marital status | ||||
| Ever | 83 | 163 | 208 | |
| Never | 3 | 1 | 5 | 0.25 |
| Occupation | ||||
| Worker | 19 | 65 | 69 | |
| Official/administrator | 3 | 3 | 9 | |
| Technician/professional | 7 | 8 | 6 | |
| Businessman | 8 | 11 | 11 | |
| Other | 49 | 77 | 18 | 0.08 |
| Education | ||||
| College & above | 12 | 18 | 23 | |
| High school | 17 | 29 | 34 | |
| Middle school | 45 | 94 | 132 | |
| Elementary school or none | 12 | 23 | 24 | 0.65 |
| Personal income2 | ||||
| ≤ ¥10 000 | 53 | 92 | 134 | |
| ¥10 001-20 000 | 21 | 45 | 51 | |
| > ¥20 000 | 9 | 16 | 21 | 0.53 |
1Definition: case, those completing both a fecal occult blood test (FOBT) and colonoscopy; control 1, those having a positive FOBT but refusing a colonoscopy, and control 2, those who refused both an FOBT and colonoscopy in a CRC screening program in 2004.
2
Estimated by yearly household income in Chinese Dollar (Yuan) divided by total number of family members.