Table 3.

Clinical Questions 1 and 2: Comparison of WDRC, compression limiting, and peak clipping on HA self- and parent report outcomes.

Citation	Condition	Compression settings	HA preference
Christensen (1999)	WDRC	Threshold: Low: 45–50 dB SPL Attack time: 5 ms Release time: 50 ms Ratio: Variable: 1.1:1–7.8:1 Volume control: listener unable to adjust during testing	6 of 12 participants returned diary Participants preference for overall best processing strategy (for all environments): linear PC 1/6; linear CL 2/6; WDRC 3/6 Participant preference for school: WDRC 6/6 Participant preference for home: linear PC 2/6; linear CL 2/6; WDRC 2/6 Willing to switch memories for different listening conditions? yes 6/6
	Linear CL	Threshold: high 75 dB Attack time: 5 ms Release time: adjustable up to 1 s Ratio: 8:1 Volume control: listener unable to adjust during testing
	Linear PC	Threshold: none Attack time: instantaneous Release time: instantaneous Ratio: none Volume control: listener unable to adjust during testing
Gou et al. (2002)	WDRC	Threshold: 40 dB Attack time: NR Release time: NR Ratio: NR Volume control: NR	Listening Skills Inventory-Child: significance testing not completed Listening Skills Inventory-Parent: p < .05 (favors WDRC) in all 12 categories
	Own linear	Threshold: NR Attack time: NR Release time: NR Ratio: NR Volume control: fixed
Marriage et al. (2005)	WDRC	Threshold: 40 dB at 200 Hz; 25 dB at 4400 Hz Attack time: 5 ms Release time: 30 ms Ratio: 1.2:1 to 3.0:1 Volume control: NR	Profound: 7/9 children kept study HAs; of the 7: 5/7 preferred WDRC 1/7 preferred linear CL 1/7 preferred linear PC Severe: 5/6 children kept study HAs; of the 5: 2/5 preferred WDRC 2/5 preferred linear CL 1/5 preferred linear PC
	Linear CL	Threshold: high Attack time: 0.5 ms Release time: 50 ms Ratio: NR Volume control: NR
	Linear PC	Threshold: high Attack time: 0.5 ms Release time: 5 ms Ratio: NR Volume control: NR

Note. WDRC = wide dynamic range compression.