112 | Chapter 6 On average, the number of prevented fall-related injuries was 0.27 (95% CI:-0.14; 0.69) for the intervention compared to the control group. The ICER was €-14,569 per prevented injury, with 89% of the bootstrapped cost-effect pairs in the southeast quadrant of the cost-effectiveness plane (Appendix 6.4, Figure A6.4A). The probability of cost-effectiveness of the intervention compared to the control group was 98% at a WTP threshold of €0 per prevented injury and 98% at a WTP threshold of €10,000 per prevented injury (Appendix 6.4, Figure A6.4B). For QALYs based on the EQ-5D-5L, the intervention group gained 0.02 QALYs (95% CI:-0.03 to 0.08) compared to the control group. The ICER was €-168,265 per QALY gained, with 79% of the bootstrapped cost-effect pairs in the southeast quadrant of the cost-effectiveness plane (more QALYs, less costly) (Figure 6.2C). The probability that the intervention was cost-effective compared to the control was 98% at a WTP threshold of €0 per QALY gained and 98% at a WTP threshold of €50,000 per QALY gained (Figure 6.2D). For QALYs based the ASCOT, the difference in QALYs was 0.03 in favor of In Balance (95% CI: -0.002 to 0.061). The ICER was €-135,797 per QALY gained, with 96% of the bootstrapped cost-effect pairs in the southeast quadrant of the cost-effectiveness plane (Appendix 6.5, Figure A6.5A). The probability of cost-effectiveness of the intervention compared to the control was 98% at WTP threshold of €0 per QALY gained and 99% at a WTP threshold of €50,000 per QALY gained (Appendix 6.5, Figure A6.5B).
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