Table 3. ROI Results in Scenario Analysis.

Scenario analyses	ROI ratio, $ (95% UI)^a
	5 y		10 y
	Bridges	Cliff sites	Bridges	Cliff sites
Baseline model	1.7 (1.0 to 1.9)	1.7 (−0.9 to 3.3)	2.4 (1.5 to 2.7)	2.0 (−1.1 to 3.8)
No increased suicide every year	1.5 (1.0 to 1.7)	1.7 (−0.8 to 3.3)	2.0 (1.3 to 2.3)	2.0 (−1.0 to 3.8)
Cost saving estimated by the value of statistical life-year	0.2 (0.1 to 0.2)	0.2 (−0.1 to 0.4)	0.5 (0.3 to 0.6)	0.4 (−0.2 to 0.9)
Lower maintenance^b	1.9 (1.2 to 2.1)	2.2 (−1.0 to 4.1)	3.1 (2.0 to 3.4)	3.2 (−1.5 to 5.9)
Higher maintenance^c	1.6 (1.0 to 1.7)	1.5 (−0.8 to 2.9)	2.1 (1.4 to 2.4)	1.7 (−0.9 to 3.3)

Abbreviations: ROI, return on investment; UI, uncertainty interval.

^{^a}

ROI ratio indicates US$ saved per US $1 invested.

^{^b}

Estimated minor maintenance cost of 5% and major maintenance cost of 20% of total installation costs.

^{^c}

Estimated minor maintenance cost of 30% and major maintenance cost of 60% of total installation costs.