Table 2.

Study description and protocol used

ID	Source – Country – Study design	Starting year + duration in months	Criteria used for assessment of Audiological Risk	Healthcare Setting	Tests	Number of tests (before discharge; after d.; total)	Extent of Hearing Loss for screening phase	Operator performing the test	Testing environmental conditions
1	Bevilacqua M, 2010 [33] – Brasil - Hospital-based series	not exactly known, starting from 2004 to 2007 + 36 m	JCIH 2007	1 Hospital	OAEa	1; 1; 2	40 dB HL; unilateral	Audiologist	Non-sound-treated room (average noise < 45 dB)
2	Calevo M, 2007 [34] – Italy – multicentric Hospital-based series	2002, February + 35 m	JCIH 1994	13 Hospitals	Bothb	1; 3; 4	50 dB SPLb,c; unilateral	N.R.	Sound-proof and faradized room
3	Cebulla M, 2012 [35] – Germany - Hospital-based series	2006, March + 60 m	N.R.	1 Well baby nursery - University maternity clinic	ABRa	1; 1; 2	35 dB nHLd (aABR); unilateral	Trained physician assistants, nurses	Quiet room (stage 1); acoustically and electrically shielded room(stage 2)
4	De Capua, 2007 [36] – Italy – Multicentric hospital-based series	1998, April + 100 m	JCIH, 2000	3 hospitals	Bothe	1; 2; 3	30 dB nHLd; unilateral	Technician	Silent room
5	Guastini L, 2010 [37] – Italy - Hospital-based series	2006, January + 36 m	Ad hoc	1 University Hospital	Bothb	1; 3; 4	40 dB HL; unilateral	ENT specialists experienced in neonatal screening techniques	Sound-proof and faradised room
6	Habib H, 2005 [38] – Saudi Arabia - Hospital-based series	1996, September + 89 m	JCIH 1994	1 Hospital	OAEa	2; 0; 2	26 dB HL; unilateral	Technician	N.R.
7	Kennedy C, 2005 [39] - UK - Prospective cohortf	1993, October + 36 m	Ad hoc	4 Hospitals	Botha	2; 0; 2	40 dB HL; bilateral	Trained nurse	N.R.
8	Korres S, 2008 [40] – Greece - Hospital-based series	N.R. + N.R.	N.R.	1 Hospital	OAE	3; 1; 4	40 dB HL; unilateral	Audiologist	Quite room
9	Lin H, 2007 [41] – Taiwan - Retrospective cohort	a) 1998, November + 60 m;	N.R.	1 Hospital	a) OAEa b) Botha c) ABRa	a) 2–3; 0; 2–3 b) 2; 0; 2 c) 2; 0; 2	N.R.; unilateral	N.R.	N.R.
		b) 2004, February + 12 m;
		c) 2005, March + 14 m
10	Rohlfs AK, 2010 [42] – Germany – multicentric hospital based series	2002 August + 48 m	Ad hoc	14 birth clinics and children hospitals	Both	2; 1; 3	35 dB (aABR); unilateral	Trained nurses and physicians	N.R.
11	Tatli MM, 2007 [43] – Turkey - Prospective cohort	2002 + 18 m	Ad Hoc	1 University Hospital	OAEa	1; 1; 2	N.R.; unilateral	N.R.	Quite room
12	Tsuchiya H, 2006 [44] – Japan - Prospective cohort	1999, July + 64 m	N.R.	1 Hospital	ABRa	1; 1; 2	35 dB HL (aABR); unilateral	Technician	N.R.

^aNo differences for neonates with audiological risk were specified

^bWith both automatic and diagnostic ABR

^cEquivalent to about 40db HL in voice frequency

^ddB nHL = Decibel Normal Hearing

^eDiagnostic instead of automatic ABR

^fData not reported in Kennedy have been gathered from Wessex [45]