Table 1.
Characteristics of participants at enrolment in NCRCC study.
| Characteristics | CRCSC | CRCPC |
| N=19 377 (%) | N=15 551 (%) | |
| Gender | ||
| Men | 48.2 | 61.4 |
| Women | 51.8 | 38.6 |
| Age (year) | 58.7±8.3 | 60.3±12.3 |
| <50 | 15.1 | 18.9 |
| 50–65 | 56.8 | 42.9 |
| ≥65 | 28.1 | 38.2 |
| Education | ||
| No formal education | 30.4 | 21.8 |
| Elementary | 33.2 | 26.3 |
| Middle school | 30.7 | 25.0 |
| High/technical school | 4.7 | 12.9 |
| College or above | 1.0 | 14.0 |
| Family history of cancer | 29.9 | 26.6 |
| BMI(kg/m2） | 23.4±3.1 | 23.2±3.3 |
| Normal weight (18.5–24) | 55.39 | 53.8 |
| Underweight (<18.5) | 4.4 | 6.9 |
| Overweight (24–27.9) | 33.2 | 31.8 |
| Obesity(≥28) | 7.1 | 7.5 |
CRCPC, Colorectal Cancer Patients Cohort; CRCSC, Colorectal Cancer Screening Cohort; NCRCC, National Colorectal Cancer Cohort.