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Table 1 Patient-, procedure-, and endoscopist-level characteristics

From: The analysis of multilevel factors affecting adenoma detection rates for colonoscopies: a large-scale retrospective study

Variables Total colonoscopy (n = 10,788) (%) Adenoma (n = 2180) (%) No adenoma (n = 8608) (%) p value*
Sex     < 0.001
 Female 5280 (48.9) 821 (15.5) 4459 (84.5)  
 Male 5508 (51.1) 1359 (24.7) 4149 (75.3)  
Age, years     < 0.001
 < 40 1927 (17.9) 101 (5.2) 1826 (94.8)  
 40–49 2236 (20.7) 311 (13.9) 1925 (86.1)  
 50–59 3100 (28.7) 702 (22.6) 2398 (77.4)  
 60–69 2435 (22.6) 715 (29.4) 1720 (70.6)  
 > 70 1090 (10.1) 351 (32.2) 739 (67.8)  
Mean (± SD) 52.62 ± 13.7 58.73 ± 10.91 51.08 ± 13.90 < 0.001
Sedation     < 0.001
 No 3207 (29.7) 506 (15.8) 2701 (84.2)  
 Yes 7581 (70.3) 1674 (22.1) 5907 (77.9)  
Colonoscopy method     < 0.001
 Single-examiner 7115 (66.0) 1549 (21.8) 5566 (78.2)  
 Dual-examiner 3673 (34.0) 631 (17.2) 3042 (82.8)  
Endoscopist’s experience     < 0.001
 Junior 7839 (72.7) 1366 (17.4) 6473 (82.6)  
 Senior 2949 (27.3) 814 (27.6) 2135 (72.4)  
Endoscopist’s sex     0.001
 Female 3651 (33.8) 672 (18.4) 2979 (81.6)  
 Male 7137 (66.2) 1508 (21.1) 5629 (78.9)  
  1. *p value: Student’s t-test for continuous variables and χ2 test for categorical data