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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