Table 1.

Incidence and characteristics of IEMs.

	Urban	Suburban and rural	χ2	P-value	Total
Recruited	15,731	32,566			48,297
Presumptive positive (positive in first screening)	255	514			769
Positive rate (%)	1.62	1.58			1.59
Recalled	249	476			725
Recall rate (%)	1.58	1.46	8.03	0.005	1.50
Definitive diagnosis	6	35			41
Positive predictive value (%)	2.41	7.35	7.49	0.006	5.66
Incidence (1 in)	2622	930	6.01	0.014	1178
Corrected incidence (1 in)	2560	862			1110