Study	Reason for exclusion
Aazh 2016	ALLOCATION: randomised PARTICIPANTS: at the level of randomisation participants were people who had been previously fitted with hearing aids but were not using them.
Andersson 1998	Collated data on hearing aid use from 3 previous studies (see Andersson 1994; Andersson 1995; Andersson 1997). Where possible we have included the relevant data on hearing aid use as reported in the original studies
Bevilacqua 2013	ALLOCATION: randomised PARTICIPANTS: not all adults according to the definition given in this review and cannot extract the data for the adults separately
Boymans 2012	ALLOCATION: randomised PARTICIPANTS: new and experienced adult hearing aid users INTERVENTION: audiologist versus patient‐driven fine tuning OUTCOME: speech perception measures
Cardemil 2014	ALLOCATION: unclear in published study but not randomised according to trial registration
Hallberg 1994	ALLOCATION: randomised PARTICIPANTS: not all hearing aid users and cannot extract the data for the hearing aid users independently
Hennig 2012	ALLOCATION: not randomised
Hickson 2007	ALLOCATION: randomised PARTICIPANTS: not all hearing aid users and cannot extract the data for the hearing aid users independently
Kuk 2014	ALLOCATION: not randomised
Lavie 2013	ALLOCATION: randomised PARTICIPANTS: adult new hearing aid users INTERVENTION: individual listening training OUTCOME: speech perception measures only
Montgomery 1984	ALLOCATION: randomised PARTICIPANTS: new adult hearing aid users INTERVENTION: individual versus group auditory training OUTCOME: speech perception measures
Norman 1994	ALLOCATION: not randomised
Preminger 2003	ALLOCATION: part‐randomised and data not available for randomised participants only
Reber 2005	ALLOCATION: part‐randomised and data not available for randomised participants only
Ruschel 2007	ALLOCATION: randomised PARTICIPANTS: new adult hearing aid users INTERVENTION: 5 sessions of auditory rehabilitation including guidance on communication strategy OUTCOME: non‐validated questionnaire relating to ease of use and communication
Stecker 2006	ALLOCATION: randomised PARTICIPANTS: new adult hearing aid users INTERVENTION: 40 x 1‐hour sessions of analytic auditory training OUTCOME: speech perception measures
Walden 1981	ALLOCATION: randomised PARTICIPANTS: new adult hearing aid users INTERVENTION: 7 hours of individual versus group auditory training OUTCOME: speech perception measures
Yueh 2010	ALLOCATION: randomised PARTICIPANTS: at the level of randomisation no participants were hearing aid users and only a proportion became hearing aid users