Table 3:
Multivariate analysis of factors associated with contamination by Total Coliform.
| Factors | Total Coliform | |||
|---|---|---|---|---|
|
| ||||
| Total | n (%) | OR (95% CI) | P - Value | |
| 170 | 74 (44) | |||
| Hour of collection | ||||
| 12–3 PM | 111 | 39 (35.1) | 1 | |
| 3–4 PM | 32 | 17 (53.1) | 2.91 (1.06, 8.02) | 0.039 |
| 4–5 PM | 27 | 18 (66.6) | 3.50 (1.07,11.14) | 0.038 |
| Day of sampling | ||||
| Friday | 85 | 30 (35.3) | 1 | |
| Saturday | 85 | 44 (51.8) | 2.00 (2.12, 0.95) | 0.066 |
| Number of swimmers | ||||
| <=20 | 84 | 28 (33.3) | 1 | |
| >20 | 86 | 46 (53.5) | 3.15 (1.41, 7.01) | 0.005 |
| Temperature | ||||
| 22–27°C | 83 | 24 (28.9) | 1 | |
| >27 °C | 87 | 50 (57.5) | 2.84 (1.27, 6.31) | 0.011 |
| Free residual chlorine* | ||||
| 1–2 mg/l | 79 | 20 (25.3) | 1 | |
| <1 mg/l | 61 | 45 (73.8) | 8.29 (3.44,19.98) | <0.0001 |
| >2 mg/l | 20 | 06 (30.0) | 1.00 (0.27, 3.72) | 0.997 |
| pH value | ||||
| 7.2–7.8 | 149 | 63 (45.0) | 1 | |
| <7.2 | 15 | 08 (53.3) | 1.53 (0.30, 7.81) | 0.606 |
| >7.8 | 06 | 03 (50.0) | 0.93 (0.13, 6.75) | 0.941 |
OR: Adjusted odds ratio.