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Table 1 Baseline clinical characteristics of patients in the training and validation cohorts

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)