Table 1. Baseline Characteristics.
| Characteristic | Patients, No. (%) | P value | |
|---|---|---|---|
| Early session (n = 1041) | Late session (n = 739) | ||
| Age, mean (SD), y | 50.14 (13.21) | 48.53 (13.59) | .01 |
| Sex | |||
| Male | 497 (47.74) | 340 (46.01) | .47 |
| Female | 544 (52.26) | 399 (53.99) | |
| Body mass indexa | |||
| <25 | 791 (75.98) | 594 (80.38) | .05 |
| 25 to <30 | 223 (21.42) | 124 (16.78) | |
| ≥30 | 27 (2.59) | 21 (2.84) | |
| Indication of colonoscopy | |||
| Screening | 670 (64.36) | 414 (56.02) | <.001 |
| Diagnostic | 283 (27.19) | 276 (37.35) | |
| Surveillance | 88 (8.45) | 49 (6.63) | |
| Inpatient | 190 (18.25) | 158 (21.38) | .10 |
| Outpatient | 851 (81.75) | 581 (78.62) | |
| Endoscope vendor | |||
| Olympus | 686 (65.90) | 482 (65.22) | .09 |
| Fujifilm | 304 (29.20) | 203 (27.47) | |
| Sonoscape | 51 (4.90) | 54 (7.31) | |
| Withdrawal time, mean (SD), min | 8.21 (4.33) | 7.81 (4.38) | .07 |
| Bowel preparation | |||
| Boston bowel preparation scale | |||
| <2 In any segment | 125 (12.01) | 80 (10.83) | .44 |
| ≥2 In all segments | 916 (87.99) | 659 (89.17) | |
| Endoscopist experience | |||
| High experience | 465 (44.67) | 347 (46.96) | .42 |
| Mid experience | 472 (45.34) | 312 (42.22) | |
| Low experience | 104 (9.99) | 80 (10.83) | |
a
Body mass index is calculated as weight in kilograms divided by height in meters squared.