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Table 1 The number of measurements and distribution of TTHMs between three exposure categories and reference category.

From: Water disinfection by-products and the risk of specific birth defects: a population-based cross-sectional study in Taiwan

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