Table 2.
Descriptive statistics of study variables for 264 census tracts in San Antonio, TX.
| Variable | Definition | Mean | SD | Min | Max |
|---|---|---|---|---|---|
| Dependent variable | |||||
| Fall injuries (aged 65+) | Imputed total fall count among residents by age groups between 2011–2014 | 51.50 | 35.76 | 3.77 | 224.35 |
| Fall injuries (aged 65–84) | 32.68 | 19.85 | 3.61 | 112.08 | |
| Fall injuries (aged 85+) | 18.81 | 18.46 | 0.00 | 116.20 | |
| Confounding variable | |||||
| Incompleteness rate (aged 65+) | Count of incompletely geocoded fall cases/total imputed fall counts within census tract by age groups | 0.37 | 0.27 | 0.00 | 1.00 |
| Incompleteness rate (aged 65–84) | 0.38 | 0.27 | 0.00 | 1.00 | |
| Incompleteness rate (aged 85+) | 0.36 | 0.29 | 0.00 | 1.00 | |
| Population aged 65+ | Number of population by age groups (Exposure variable) | 504.98 | 258.42 | 62.00 | 1401.00 |
| Population aged 65–84 | 437.43 | 217.75 | 62.00 | 1305.00 | |
| Population aged 85+ | 67.55 | 66.84 | 0.00 | 448.00 | |
| Areas (acres/1000) | Size of each census tract (acres/1000) | 0.87 | 1.00 | 0.18 | 11.46 |
| Demographic and socioeconomic status | |||||
| Net population density | Total population/residential land acreage | 17.74 | 7.79 | 2.23 | 78.31 |
| Median household income ($/10,000) | Median household income ($/10,000) | 4.67 | 2.51 | 0.98 | 18.59 |
| % older adults below poverty level | Residents aged 65+ living at poverty level/total residents aged 65+ × 100 | 13.90 | 11.65 | 0.00 | 57.60 |
| Residential stability | |||||
| % owner-occupied | Owned housing units/total housing units × 100 | 20.00 | 7.00 | 2.24 | 39.02 |
| % residence 1 year and over | Residents living in the same house 1 year ago/total residents × 100 | 81.10 | 10.56 | 34.75 | 97.97 |
| Household structure and housing condition | |||||
| Percent living alone | Living alone households/family households × 100 | 36.52 | 13.96 | 3.21 | 85.60 |
| % older housing | Housing units built before 1950/total housing units × 100 | 21.39 | 31.71 | 0.00 | 94.17 |
| Dwelling type | |||||
| % single-family units | Single-family housing units/total housing units × 100 | 78.35 | 26.93 | 1.57 | 120.80 |
| % multi-family units | Multi-family housing units/total housing units × 100 | 31.78 | 29.53 | 0.00 | 126.89 |
| Socio-physical disorder | |||||
| % vacant housing units | Vacant housing units/total housing units × 100 | 10.28 | 5.93 | 0.00 | 33.08 |
| Property crime (n/1000) | Total property crime count between 2011–2014 (n/1000) | 2.63 | 1.65 | 0.23 | 11.82 |