Table 3.

Incidence rate ratios (IRRs) comparing the incidence rates of crashes (N, crashes = 48) occurring on segments excluding intersections.

	Compared to segments without infrastructure segments; no confounding adjustment		Estimated effects: adjusted for roadway type, area-level population density and household incomea
Infrastructure type	IRR, at-risk measure: Strava-reported bicycle-distance (95% CI)	IRR, at-risk measure: estimated (IPSW) bicycle-distance adjusted for Strava use (95% CI)	IRR, at-risk measure: Strava-reported bicycle-distance (95% CI)	IRR, at-risk measure: estimated (IPSW) bicycle-distance adjusted for Strava use (95% CI)
Off-street paved trail	0.0 (0.0, 0.0)	0.0 (0.0, 0.0)	N/R	N/R
Protected bike lane	1.5 (0.0, 3.5)	1.1 (0.0, 2.5)	0.7 (0.0, 3.4)	0.5 (0.0, 2.5)
Buffered bike lane	0.0 (0.0, 0.0)	0.0 (0.0, 0.0)	0.0 (0.0, 0.0)	0.0 (0.0, 0.0)
Conventional bike lane	3.3 (1.3, 3.9)	3.7 (1.3, 4.0)	2.6 (1.2, 5.5)	2.8 (1.2, 6.0)
Shared-travel lane	1.2 (0.2, 1.8)	1.4 (0.2, 2.0)	1.1 (0.2, 2.9)	1.1 (0.2, 2.9)
No infrastructure	Referent	Referent	N/A	N/A

Abbreviations: IRR, incidence rate ratio; CI, confidence interval; IPSW, inverse-probability-of-selection weighted; N/R, not reported; N/A, not applicable.

^aEstimated effect of treatment on the treated via model-based standardization. Please see text for additional details.