Digestive Diseases and Sciences

, Volume 58, Issue 11, pp 3127–3133 | Cite as

Body Mass Index, Age, and Gender Affect Prep Quality, Sedation Use, and Procedure Time During Screening Colonoscopy

  • Jennifer Czwornog
  • Gregory L. Austin
Original Article



Body mass index (BMI), age, and gender influence colorectal cancer (CRC) and adenoma risk. Their effects on colonoscopy characteristics are unclear, but might inform the screening approach in patient subgroups.


The aims of this study were to assess the effect of BMI, age, and gender on prep quality, amount of sedation, procedure time, and adenoma prevalence for screening colonoscopy.


We conducted a review of 773 eligible colonoscopies performed for average-risk CRC screening. We performed multivariable regression analyses to assess the outcomes of prep quality, amount of fentanyl and midazolam used, procedure time, and the adenoma prevalence rate (APR).


Obese patients were less likely (p = 0.01) to have a good or excellent prep, had similar procedure times, and received similar amounts of fentanyl and midazolam. Increasing age had no effect on prep quality or procedure time, but was associated with decreased fentanyl and midazolam (both p ≤ 0.001). Women had similar prep quality, longer procedure times (increased by 2.8 ± 0.7 min, p < 0.001) for colonoscopies in which no polyps were detected, and received more fentanyl and midazolam (both p = 0.01). Increasing BMI, increasing age, and male gender were associated with an increased APR. The APR for women aged 50–59 with a normal BMI was 17.9 %.


Normal-weight females, particularly those under age 60, have the lowest APR but have longer procedure times and require higher amounts of sedation. Screening options other than colonoscopy might be well-suited to this population.


Colorectal cancer screening Age Gender Body mass index Adenoma prevalence 



Adenoma prevalence rate


Colorectal cancer


Body mass index


Conflict of interest



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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Division of Gastroenterology and HepatologyUniversity of Colorado DenverAuroraUSA

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