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Demographic characteristics and FOBT type
| Mean age in years (SD) | 61 (6) |
| Male/female (ratio) | 187/115 (1.6:1) |
| Ethnicity: total number of whites | 291 (97%) |
| Highest education level: | |
| Primary school | 20 (7%) |
| High school | 27 (9%) |
| Vocational education | 173 (57%) |
| University | 77 (25%) |
| Not provided | 5 (2%) |
| Nett income per month | |
| <US$2059/>US$2059/not provided | 88/131/83 |
| FOBT: | |
| G-FOBT | 54 (18%) |
| I-FOBT | 248 (82%) |
FOBT, faecal occult blood test; G-FOBT, guaiac FOBT; I-FOBT, immunochemical FOBT.
