Table 1.
Baseline characteristics of the study population
| Variable | Male (n = 6,413) | Female (n = 6,148) | p valuea |
|---|---|---|---|
| Age, yr | 57.5 ± 13.8 | 57.8 ± 13.5 | 0.695 |
| 20–39 | 754 (11.6) | 584 (9.5) | |
| 40–59 | 2,615 (40.8) | 2,545 (41.4) | |
| 60–75 | 2,505 (39.1) | 2,527 (41.1) | |
| > 75 | 548 (8.5) | 492 (8.0) | |
| Indications of colonoscopy | |||
| Screening | 2,599 (40.5) | 2,535 (41.2) | 0.425 |
| Symptoms | 1,089 (17.0) | 1,420 (23.1) | < 0.001 |
| Colorectal cancer | 406 (6.3) | 289 (4.7) | < 0.001 |
| Polyp | 1,156 (18.0) | 666 (10.8) | < 0.001 |
| Inflammatory bowel disease | 371 (5.8) | 214 (3.5) | < 0.001 |
| Others | 792 (12.3) | 1,024 (16.7) | |
| Non-sedation colonoscopy | 68 (1.0) | 54 (0.8) | 0.503 |
| Sedation colonoscopy | 6,345 (98.9) | 6,094 (99.2) | |
| Midazolam, mg | 4.5 ± 1.0 | 4.3 ± 1.2 | < 0.001 |
| Pethidine, mg | 36.7 ± 12.8 | 38.2 ± 12.9 | 0.001 |
| Bowel preparation drugb | < 0.001 | ||
| Coolprep | 6,248 (97.6) | 5,912 (96.3) | |
| Picosolution | 156 (2.4) | 225 (3.7) |
Values are presented as mean ± SD or number (%).
a
p < 0.05 was statistically significant.
b
Missing value: preparation drug. Twenty cases (nine males, 11 females) could not be identified in the Clinical Data Warehouse.
Maybe these subjects received prescription of preparation drug from other doctors.