Table 2.
Association of GPS Measures and Incident Falls Over 12 Months
| Unadjusted | Adjusted | |||||
|---|---|---|---|---|---|---|
| IRR | 95% CI | p | IRR | 95% CI | p | |
| Median SDE Area | ||||||
| Quartile 1 versus 4 | 0.80 | 0.36–1.81 | 0.60 | 1.14 | 0.54–2.40 | 0.73 |
| Quartile 2 versus 4 | 1.29 | 0.62–2.66 | 0.50 | 1.18 | 0.59–2.37 | 0.63 |
| Quartile 3 versus 4 | 0.55 | 0.23–1.28 | 0.17 | 0.39* | 0.16–0.94 | 0.04 |
| Median SDE compactness | ||||||
| Quartile 1 versus 4 | 1.69 | 0.72–4.00 | 0.23 | 1.12 | 0.48–2.60 | 0.80 |
| Quartile 2 versus 4 | 1.47 | 0.63–3.43 | 0.38 | 1.56 | 0.69–3.55 | 0.29 |
| Quartile 3 versus 4 | 1.99 | 0.87–4.53 | 0.10 | 2.29* | 1.05–5.00 | 0.04 |
| Median % of time outside of home | ||||||
| Continuous (per 5%) | 1.06 | 0.94–1.20 | 0.37 | 1.01 | 0.90–1.14 | 0.86 |
| Quartile 1 versus 4 | 0.78 | 0.36–1.72 | 0.54 | 0.88 | 0.42–1.85 | 0.73 |
| Quartile 2 versus 4 | 0.81 | 0.38–1.72 | 0.59 | 0.89 | 0.44–1.81 | 0.75 |
| Quartile 3 versus 4 | 0.97 | 0.46–2.04 | 0.93 | 0.90 | 0.44–1.87 | 0.79 |
| Median maximum distance from home | ||||||
| Quartile 1 versus 4 | 0.87 | 0.41–1.85 | 0.71 | 1.54 | 0.72–3.30 | 0.27 |
| Quartile 2 versus 4 | 0.41* | 0.18–0.94 | 0.03 | 0.58 | 0.26–1.28 | 0.18 |
| Quartile 3 versus 4 | 0.59 | 0.28–1.25 | 0.17 | 0.93 | 0.43–1.99 | 0.85 |
Notes: Adjusted models included the following covariates: age, gender, race, BMI, Duke Comorbidity Index, Fall history. CI = confidence interval; IRR = incident rate ratio; SDE = standard deviational ellipse.
* p < .05.