Family type | N | Sex (M/F) | Mean age of subjects (years) | Detection rate of adenomas (n (%)) | Detection rate of AAPs (n (%)) | |

Group A | 1 FDR <50 | 224 | 99/125 | 52.20 | 35 (15.6)^{*} | 12 (5.4)^{†} |

Group B | 2 FDR with CRC | 232 | 105/127 | 55.40 | 51 (22.0)^{*} | 25 (10.8)^{†} |

Subgroups group B | 2 FDR <70 | 98 | 48/50 | 55.70 | 15 (15.3)^{‡} | 9 (9.2)^{§} |

1 FDR <70 and 1 FDR ≥70 | 108 | 45/63 | 55.48 | 27 (25.0)^{‡} | 12 (11.1)^{§} | |

2 FDR ≥70 | 26 | 12/14 | 54.40 | 9 (34.6)^{‡} | 4 (15.4)^{§} |

↵* Detection rate of adenomas between group A and B. p=0.09 (χ

^{2}), not significant, corrected for sex and age of subjects (ANOVA).↵† Detection rate of AAPs between group A and B. p=0.04 (χ

^{2}), not significant, corrected for sex and age (ANOVA).↵‡ Detection rate of adenomas between the subgroups of group B. p=0.06 (χ

^{2}), p=0.02 corrected for sex and age (ANOVA).↵§ Detection rate of AAPs between the subgroups of group B. Not significant.

ANOVA, analysis of variance; F, female; FDR, first-degree relative; M, male.