Retrospective Study
Copyright ©The Author(s) 2019.
World J Gastroenterol. Dec 28, 2019; 25(48): 6916-6927
Published online Dec 28, 2019. doi: 10.3748/wjg.v25.i48.6916
Table 6 Relative risk, attributable risk, and number needed to harm analysis
VariableRisk95%CI
All, SA vs delayed
Relative risk4.2x1.4 to 12.9a
Attributable risk14.1%4.6 to 23.6a
Number needed to harm85.0 to 12.3a
Grade 1, SA vs delayed
Relative risk1.7x0.5 to 5.1a
Attributable risk4.9%-5.7 to 15.5
Number needed to harm21-7.2 to 24.4
Grade 2, SA vs delayed
Relative risk1
Attributable risk26.4%13.2 to 39.7a
Number needed to harm43.0 to 5.0a
Grade 2 or 32, SA vs delayed
Relative risk1
Attributable risk28.3%12.3 to 44.4a
Number needed to harm42.9 to 4.6a