Table 2 Study description and protocol used

1

Bevilacqua M, 2010 [33] – Brasil - Hospital-based series

not exactly known, starting from 2004 to 2007 + 36 m

JCIH 2007

1 Hospital

OAE^a

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

Both^b

1; 3; 4

50 dB SPL^b,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

ABR^a

1; 1; 2

35 dB nHL^d (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

Both^e

1; 2; 3

30 dB nHL^d; unilateral

Technician

Silent room

5

Guastini L, 2010 [37] – Italy - Hospital-based series

2006, January + 36 m

Ad hoc

1 University Hospital

Both^b

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

OAE^a

2; 0; 2

26 dB HL; unilateral

Technician

N.R.

7

Kennedy C, 2005 [39] - UK - Prospective cohort^f

1993, October + 36 m

Ad hoc

4 Hospitals

Both^a

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) OAE^a

b) Both^a

c) ABR^a

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

OAE^a

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

ABR^a

1; 1; 2

35 dB HL (aABR); unilateral

Technician

N.R.