Table 1

Baseline demographic and clinical characteristics of the patients

CharacteristicStudy population (N=12 134)

  • Gender (female vs male)

 Number6447 vs 5616 [71]
 %53.1% vs 46.3% [0.6]
Age, mean age, age per 10 years6.4±0.7 [31]
NSAID
 Number104/12 030
 %0.9%
Quality of bowel preparation*—number (%)
 I4969 (43.5%)
 II5023 (44.0%)
 III1050 (9.2%)
 IV339 (3.0%)
 V34 (0.3%)
Instrument generation*—number (%)
 I2447 (20.1%)
 II2967 (24.5%)
 III616 (5.1%)
 Mixed6104 (50.3%)
Annual screening colonoscopy case volume (per 100 cases)5.6±2.4
Lifetime colonoscopy case volume (per 100 cases)163.5±58.9 [189]
Five year CME credits* (per 10 points)5.4±2.9
Average instrument withdrawal time in cases without polyps (per minute)8.7±3.4

  • The table shows the absolute and relative frequencies (in round brackets) or the arithmetic means±SDs. Figures in square brackets are numbers of missing values.

  • ↵* For the definitions of instrument generation, quality of bowel preparation and CME credits, please see the text (methods).

  • CME, continuing medical education.