From: Establishment and evaluation of a nomogram predicting risks of missed diagnoses of colorectal polyps
Variable | Training cohort (n = 699) | Validation cohort (n = 293) | P |
---|---|---|---|
Age (years),\(\overline{x} \pm SD\) | 53.7 ± 12.4 | 52.3 ± 12.3 | 0.113 |
Sex, n (%) | 0.254 | ||
Male | 441(63.1) | 196(66.9) | |
Female | 258(36.9) | 97(33.1) | |
Symptom n (%) | 0.126 | ||
No | 202(28.9) | 99(33.8) | |
Yes | 497(71.1) | 194(66.2) | |
Family history of CRC, n (%) | 0.823 | ||
No | 647(92.6) | 270(92.2) | |
Yes | 52(7.4) | 23(7.8) | |
Diverticulum history, n (%) | 0.885 | ||
No | 646(92.4) | 270(92.2) | |
Yes | 53(7.6) | 23(7.8) | |
Sedative colonoscopy, n (%) | 0.317 | ||
No | 427(61.1) | 169(57.7) | |
Yes | 272(38.9) | 124(42.3) | |
Bowel preparation, n (%) | 0.786 | ||
Adequate | 565(80.8) | 239(81.6) | |
Poor | 134(19.2) | 54(18.4) | |
Endoscopist’s experience, n (%) | 0.417 | ||
≥ 1000 | 457(65.4) | 181(61.8) | |
500 − 1000 | 170(24.3) | 83(28.3) | |
< 500 | 72(10.3) | 29(9.9) | |
Retroflected view, n (%) | 0.139 | ||
No | 628(89.8) | 272(92.8) | |
Yes | 71(10.2) | 21(7.2) | |
Withdrawal time, n (%) | 0.449 | ||
≥ 6 | 421(60.2) | 184(62.8) | |
< 6 | 278(39.8) | 109(37.2) | |
No. of polyps at first colonoscopy, n (%) | 0.031 | ||
< 2 | 327(46.8) | 159(54.3) | |
≥ 2 | 372(53.2) | 134(45.7) | |
No. of right colon polyps, n (%) | 0.684 | ||
< 2 | 594(85.0) | 246(84.0) | |
≥ 2 | 105(15.0) | 47(16.0) | |
No. of left colon polyps, n (%) | 0.126 | ||
< 2 | 576(82.4) | 253(86.3) | |
≥ 2 | 123(17.6) | 40(13.7) | |
No. of rectal polyps, n (%) | 0.781 | ||
< 2 | 650(93.0) | 271(92.5) | |
≥ 2 | 49(7.0) | 22(7.5) | |
No. of polyps < 6 mm, n (%) | 0.162 | ||
< 2 | 613(87.7) | 266(90.8) | |
≥ 2 | 86(12.3) | 27(9.2) | |
No. of polyps ≥ 6 mm, n (%) | 0.017 | ||
< 2 | 508(72.7) | 234(79.9) | |
≥ 2 | 191(27.3) | 59(20.1) | |
No. of flat polyps, n (%) | 0.409 | ||
< 2 | 619(88.6) | 254(86.7) | |
≥ 2 | 80(11.4) | 39(13.3) | |
No. of protruding polyps, n (%) | 0.001 | ||
< 2 | 439(62.8) | 217(74.1) | |
≥ 2 | 260(37.2) | 76(25.9) | |
Interval, | 21.6 ± 24.3 | 20.4 ± 23.5 | 0.466 |
Missed polyp, | 0.4 ± 0.9 | 0.5 ± 0.9 | 0.206 |
Patients with missed polyps, n (%) | 0.084 | ||
No | 535(76.5) | 209(71.3) | |
Yes | 164(23.5) | 84(28.7) |