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. 2018 Feb 12;98(4):977–983. doi: 10.4269/ajtmh.16-0954

Table 1.

Iron concentration in tubewell water and residual-free chlorine levels in treated water 30 minutes after adding a 33-mg-sodium dichloroisocyanurate tablet to 10 L of water in the small- and large-scale study

Study Subdistrict Iron concentration Residual-free chlorine
Median (IQR) Greater than 3 mg/L, n (%) Median (IQR) Less than 0.2 mg/L, n (%)
Small-scale study Kaligonj (N = 48) 1.4 (0.7–2.1) 10 (21) 1.1 (0.3–1.6) 11 (23)
Kapasia (N = 120) 1.2 (0.52–2.9) 28 (23) 1.4 (0.5–1.6) 21 (18)
Sreepur (N = 96) 1.12 (0.46–2.1) 18 (19) 1.4 (0.77–1.7) 11 (11)
Large-scale study Gafaorgaon (N = 84) 0.31 (0.17–0.62) 3 (4) 1.4 (0.92–1.7) 8 (80)
Nandail (N = 66) 0.61 (0.27–2.25) 15 (23) 1 (0.25–1.6) 14 (21)
Muktagacha (N = 60) 0.81 (0.42–1.47) 4 (7) 1.4 (1–1.7) 5 (8)
Trishal (N = 60) 1 (0.46–1.77) 7 (12) 1.3 (0.9–1.6) 8 (13)
Gouripur (N = 54) 0.73 (0.25–1.62) 7 (13) 1.8 (0.87–2.1) 4 (7)
Mirzapur (N = 66) 1.94 (0.6–5) 25 (38) 0.9 (0.07–1.6) 21 (32)
Both studies Total (N = 654) 0.91 (0.36–2) 117 (18) 1.3 (0.6–1.7) 103 (16)

IQR = interquartile range.