Table 2.

Prevalence of diarrhoea and diagnostic accuracy of next-day maternal recall compared with diaper observation of stool as the ‘gold standard’ method

Day	Diarrhoea Prevalence ‘Gold Standard’a	Specificity (95% CI)	Sensitivity (95% CI)	PPV (95% CI)	NPV (95% CI)
1	20/52 (38%)	94% (80 to 99%)	75% (51 to 91%)	88% (65 to 97%)	86% (74 to 93%)
2	25/50 (50%)	80% (61 to 94%)	56% (35 to 76%)	74% (54 to 87%)	65% (53 to 75%)

^aData presented are those of children that had completed both diaper observations and maternal recall on each given day

PPV positive predictive value, NPV negative predictive value