Table 1

Indications for colonoscopy among study participants

Reason for colonoscopyBleeding (%)Diagnostic/follow-up (%)Family history (%)Screening (%)Other (%)
Case status
 Cases36138376
 Controls50222234
MTHFR genotype
CC431813205
CT401717215
TT441815176
Sex
 Male381614275
 Female452017135
Age group
 <60 yr411918175
 ≥60 yr421710266