Table 1. Effect of zinc on duration of diarrhoea by type of diarrhoea in a sample of episodes Type of diarrhoea Intervention Comparison Hazards ratio* (95% CI) No of episodes Mean (SD) episode duration (days) No of episodes Mean (SD) episode duration (days) Non-dysenteric 560 4.6 (3.6) 582 5.8 (4.7) 0.77 (0.64 to 0.92) Dysentery  60 6.0 (4.3)  50 7.3 (4.2) 0.62 (0.44 to 0.89) All 620 4.7 (3.7) 632 5.9 (4.6) 0.76 (0.65 to 0.90) * Adjusted for child's age, sex, and birth order, mother's education, and household homestead land size.