Table 2.
Quality of measures in analyses.
| Number of Analyses | Percent of Analyses | |
|---|---|---|
| Health data quality | ||
| Objective | 115 | 44% |
| Expert or clinical diagnosis | 55 | 21% |
| Subjective | 90 | 35% |
| Greenspace measure | ||
| Greenness a | 124 | 48% |
| Green or open space b | 110 | 42% |
| Park b | 23 | 9% |
| Tree canopy b | 3 | 1% |
| Confounds included | ||
| Education level | 221 | 85% |
| Sex | 220 | 85% |
| Age | 209 | 80% |
| Smoking behavior | 78 | 30% |
| Employment status | 74 | 28% |
| Urbanity | 68 | 26% |
| BMI | 62 | 24% |
| Race/ethnicity | 60 | 23% |
| Marital status | 49 | 19% |
| Income | 44 | 17% |
| Bias Evaluation | ||
| More likely to be biased | 2 | 1% |
| Less likely to be biased | 114 | 44% |
| Least likely to be biased | 144 | 55% |
a average value or standard deviation of NDVI; b percent land cover or number of units (i.e., parks or trees).