# Table 2 Incremental net benefits for six willingness-to-pay values to prevent a fall for the total sample and by age subgroups

Total sample, all ages (n = 92)a Young-old group, 75–84 years (n = 49)b Old-old group, 85–95 years (n = 43)b
WTP INB of intervention (CAD) [95% CI] P INB of intervention (CAD) [95% CI] P INB of intervention (CAD) [95% CI] P
WTP = 0 CAD −5441 [−15,622 to 4739] 0.291 −20,766 [−35,144 to −6388] 0.006 7739 [−5384 to 20,861] 0.240
WTP = 1000 CAD −5518 [−15,825 to 4789] 0.290 −19,816 [−34,355 to −5277] 0.009 6190 [−7235 to 19,614] 0.356
WTP = 5000 CAD −5825 [−17,909 to 6259] 0.341 −16,015 [−31,981 to −49] 0.049 −6 [−17,845 to 17,834] 0.999
WTP = 10,000 CAD −6208 [−22,389 to 9972] 0.448 −11,264 [−30,383 to 7855] 0.241 −7750 [−34,753 to 19,253] 0.565
WTP = 25,000 CAD −7359 [−39,756 to 25,039] 0.653 2989 [−29,753 to 35,730] 0.855 −30,983 [−90,576 to 28,611] 0.299
WTP = 50,000 CAD −9276 [−71,168 to 52,616] 0.766 26,743 [−32,402 to 85,888] 0.367 −69,704 [−186,121 to 46,713] 0.233
1. aAll six NB regression models for the full sample were adjusted for age, sex, fear of falling, and previous history of falling
2. bAll six NB models for age subgroup analysis were adjusted for sex, fear of falling, and previous history of falling
3. A positive INB indicates that the intervention was cost-effective when compared to usual care
4. INB incremental net benefit, Intervention multifactorial fall prevention intervention; CI confidence interval, P p-value, WTP willingness-to-pay