DOES QUALITY OF SCREENING COLONOSCOPY DIFFER BY WEEKDAY?

Aims Previous studies showed, that the so called „weekend effect“ exists, which means that health care on weekends is worse than on regular weekdays (Huijts DD et al., J Natl Compr Canc Netw., 2019). Aim was to see if quality of screening colonoscopy is also worse on weekends, using the adenoma detection rate (ADR) as quality indicator.

Methods 304.774 screening colonoscopies performed by 315 physicians between 2007-2019, within the Austrian certificate of screening colonoscopy got analyzed to investigate if ADR differs by weekday. ADR got calculated for each ensdoscopist. Mean ADR per weekday got compared via ANOVA and were considered significant if p< 0,05.

Results Results showed that the most screening colonoscopies were performed on Monday (n=65716) and the least on Sunday (n=3319). On Saturday 172 endoscopists performed colonoscopy and 162 on Sunday. According the ADR the highest mean ADR was reached on Saturday with 23,40% (SD=30,34%). and the lowest on Tuesday with a mean ADR of 19,29% (SD=14,41%). Still, there was no significant difference (p=0,212). Results are shown in table 1.

Tab. 1

	Mon	Tue	Wed	Thu	Fri	Sat	Sun
ADR (mean+SD)	19,44% (13,70)	19,29% (14,41)	20,60% (14,37)	20,01% (15,43)	20,59% (18,17)	23,40% (30,34)	21,73% (30,88)
Absolute numbers	n=65716	n=65400	n=60751	n=62144	n=42027	5417	3319

Conclusions There was no significant difference comparing ADRs from Monday to Sunday (p=0,212). This outcome shows that there is no decrease in quality of screening colonoscopy on the weekend. This might be because data stem from the certificate of screening colonoscopy and endoscopists, who are participating are aware of their ADR and are always trying to improve.