Difference-in-differences (DiD) analysis for the effect of emulating private-sector value-chains on the utilisation of ORS (with or without zinc) in rural Zambia, 2012–2013
| Baseline | Endline | Difference | DiD | P value | |
| Intervention (Kalomo) | 48.7 | 81.1 | 32.4 | ||
| Comparator (Monze) | 62.9 | 54.9 | −8.0 | ||
| Difference | −14.2** | 26.2*** | 40.4 | 0.000*** | |
| Intervention (Katete) | 70.2 | 71.1 | 0.9 | ||
| Comparator (Petauke) | 69.0 | 61.7 | −7.3 | ||
| Difference | 1.2 | 9.4* | 8.2 | 0.178 | |
| Intervention (Pooled) | 59.8 | 76.4 | 16.6 | ||
| Comparator (Pooled) | 66.4 | 58.2 | −8.2 | ||
| Difference | −6.6* | 18.2*** | 24.8 | 0.000*** |
P values are for the Wald test, based on linear regression.
*P<0.05, **p<0.01, ***p<0.001.
ORS, oral rehydration salts.