Exposure categories | No of samples | Mean ± SD (μg/L) | Minimum (μg/L) | 25 percentile (μg/L) | Median (μg/L) | 75 percentile (μg/L) | Maximum (μg/L) |
---|---|---|---|---|---|---|---|
Reference (TTHMs (0–4 μg/L) | 528 | 3.64 ± 0.95 | .85 | 3.50 | 3.80 | 4.06 | 4.96 |
Low (TTHMs 5–9 μg/L) | 168 | 5.57 ± 0.96 | 5.00 | 6.25 | 7.15 | 8.05 | 9.50 |
Medium (TTHMs 10–19 μg/L) | 240 | 16.48 ± 2.94 | 10.68 | 14.95 | 15.57 | 17.57 | 19.53 |
High (TTHMs 20 ± μg/L) | 228 | 23.24 ± 2.27 | 20.35 | 21.90 | 22.70 | 24.90 | 32.65 |