Table 6.

Overview of articles reporting the identified etiology of PIND, overall and specifically the IEMs.

	PIND cases	Etiology known	IEMs (% of PIND cases)
Nunn et al. (6)*	80	63	50 (62.5%)
Keene et al. (5)	60	52	45 (75.0%)
Verity et al. (3)	548	362	141**
Devereux et al. (1)	598	577	135***
Verity et al. (2)	1259	1114	660****
Verity et al. (4)	2050	1925	675*****

^*Excluded children with Rett disorder; 134 cases during study duration.

^**Only ten most common diagnoses reported. IEMs represent 82.9% of the ten most common diagnoses.

^***Only five most common diagnoses reported. IEMs represent 82.3% of the five most common diagnoses.

^****Only thirty most common diagnoses reported. IEMs represent 83.2% of the thirty most common diagnoses.

^*****Only ten most common diagnoses reported. IEMs represent 88.2% of the ten most common diagnoses.