Table 4:
Association between environmental characteristics and pulmonary NTM isolations
| Variable | Level | Adjusted Mean Count1
(95% Confidence Interval) |
P-value |
|---|---|---|---|
| Hydric soils | >20% | 26.8% (1.8%, 58.0%) | 0.03 |
| ≤20% | Reference | ||
| Acidic soils | >50% | 24.8% (−2.4%, 59.6%) | 0.08 |
| ≤50% | Reference | ||
| Percent wetland | −1.9% (−3.7%, −0.01%) | 0.03 | |
| Public water supply | > 50% households | 14.9% (−4.9%, 39.0%) | 0.15 |
| ≤50% households | Reference | ||
| Median age (years) | 3.7% (2.9%, 4.5%) | <0.001 | |
| County | |||
| Durham | 260% (140%, 440%) | <0.001 | |
| Orange | 352% (104%, 507%) | <0.001 | |
| Wake | Reference |
1
model included an offset term for population size and a two-dimensional spline smoothing function of geographic coordinates