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.