Table 2.

Certainty of Evidence Table

Intervention and Outcome	Number of studies	Study limitations	Consistency	Precision	Other factors	Overall Certainty of Evidence
Certainty of Evidence for Missed Clinic Visits
Providing free NEMT transportation reduces missed clinic visits	7 (3 controlled trials; 4 observational studies)	Serious	No serious inconsistency	No serious imprecision	Very strong mechanism	High
Certainty of Evidence for ED Visits
Providing free transportation NEMT does not affect ED visit rate	2 (1 controlled trial; 1 observational study)	Serious	No serious inconsistency	Serious imprecision	N/A	Low
Certainty of Evidence for Costs
Providing brokerage service NEMT transport reduces overall healthcare costs	1 (observational study)	Not serious	N/A	No serious imprecision	Data restricted to patients with diabetes and children with asthma	Low
Certainty of Evidence for Health Outcomes
Providing free NEMT improves health outcomes	1 (observational study)	Not Serious	N/A	No serious imprecision	Data restricted to patients with diabetes and children with asthma	Low
Providing free rideshare transport (NMT) improves health outcomes	1 (observational study)	Very Serious	N/A	Serious imprecision	N/A	Very Low