Table 2.

Tenth percentile, 50th percentile (median), and 90th percentile of the distribution of the relative impact of changing a single parameter on the estimated relative risk.

Study design	Parameter	10%ile	50%ile	90%ile
Self-controlled	Time at risk	1.06	1.36	3.20
Self-controlled	Include index date in time at risk	1.03	1.28	3.13
Self-controlled	Outcomes to include	1.01	1.17	2.24
Self-controlled	Variance of the prior	1.00	1.00	1.02
Cohort	Time at risk	1.04	1.25	2.24
Cohort	Covariate eligibility window	1.01	1.05	1.30
Cohort	Analysis strategy	1.00	1.05	1.51
Cohort	Covariates included in propensity score	1.00	1.01	1.08
Case control	Number of matched controls	1.02	1.14	1.63
Case control	Required observation time prior to outcome	1.01	1.05	1.18
Case control	Required observation time after outcome	1.01	1.04	1.19