5 The effectiveness of a nation-wide implemented fall prevention intervention in the Netherlands | 81 Effects on primary falls and fall-related injuries outcomes The ICC of fall incidence of participants between therapists was 0.004, thus there was no need to include therapist in the models. In the intervention group, 81 (61.8%) participants experienced at least one fall over 12 months follow-up, while in the control group this were 88 (66.2%) participants. The incidence rate ratio (IRR) was 0.85 (95% CI: 0.51 – 1.43) indicating that the number of falls in the intervention group was 15% less than in the control group (Table 5.2). The number needed to treat to prevent one fall was 3.32. In the intervention group, 56 (42.7%) participants experienced at least one fall-related injury, this were 67 (50.4%) participants in the control group. The IRR was 0.73 (95% CI: 0.44 – 1.19) (Table 5.2). The number needed to treat to prevent one injury was 3.69. Most results did not reach statistical significance; we only found a significant effect of the intervention in the IRR for fall-related injuries in the non-frail group.
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