Descriptive injury data by intervention, period and age groups for fall injuries related to snow and ice (primary outcome) and for other specified injuries unrelated to snow and ice (negative control outcome)
| Group and period | Snow and ice-related fall injuries (ICD-10: W00) | Other specified fall injuries unrelated to snow and ice (ICD-10: W01–W18) | ||
| No of injury patients | Mean incidence per 1000 person-winters (min–max) | No of injury patients | Mean incidence per 1000 person-winters (min–max) | |
| Control municipalities (all periods) | ||||
| Eligible ages | 49 963 | 2.84 (0–15.95) | 390 509 | 20.72 (0–39.92) |
| Ineligible ages | 45 923 | 2.67 (0–17.42) | 158 187 | 8.60 (0–35.01) |
| Programme municipalities (all periods) | ||||
| Eligible ages | 18 193 | 2.39 (0–11.04) | 188 323 | 21.65 (4.50–75.97) |
| Ineligible ages | 18 386 | 2.29 (0–11.80) | 80 930 | 8.72 (0.66–21.61) |
| Programme municipalities (preperiod) | ||||
| Eligible ages | 13 583 | 2.33 (0–11.04) | 137 545 | 21.21 (4.5–63.81) |
| Ineligible ages | 13 910 | 2.18 (0–10.53) | 58 576 | 8.36 (0.66–20.13) |
| Programme municipalities (postperiod) | ||||
| Eligible ages | 4610 | 2.67 (0–10.84) | 50 778 | 23.55 (8.98–75.97) |
| Ineligible ages | 4476 | 2.76 (0–11.80) | 22 354 | 10.25 (1.73–21.61) |
Notes: Programme municipalities (n=73) are municipalities that have distributed ice cleats; control municipalities are all other municipalities in the study sample (n=200). All periods reflect the entire study period from the winter of 2001/2002 to the winter of 2018/2019. Preperiod is the period before intervention in programme municipalities and postperiod is the period after intervention in programme municipalities (not applicable for control municipalities). Eligible ages are defined as all ages above the age of eligibility in programme municipalities, and ineligible ages are 1–15 years younger than the age of eligibility. In control municipalities, the eligible ages are defined as 65+ years and ineligible ages as 50–64 years, reflecting the most common age ranges in programme municipalities.
ICD-10, International Classification of Diseases, 10th revision.