Table 2.

Timing of data collection.

Variable	Source of Data	Baseline	Fit & Follow-up	6-month Follow-up
Baseline variables and co-variate
Co-morbidity	SIC	x
General health status	SF-12	x		x
Psychiatric conditions	PHQ	x	x	x
Demographics	CPRS	x
Type, degree of hearing loss	CPRS	x
Treatment (rehabilitation) data
Session characteristics	Research Assistant		x
Mediating Mechanisms	Questionnaire		x
Hearing aid features	CPRS			x
Costs & Utilization
Utilization: unplanned visits	CPRS			x
Costs of planned visits	CPRS, DSS			x
Costs of unplanned visits	CPRS, DSS			x
Outcomes Assessment
Hearing-related function	EAR	x	x	x
Adherence to hearing aids	Two questions		x	x
Hearing handicap	HHIE	x	x	x
Satisfaction with hearing aids	SADL		x	x
Communication Strategies	CPHI	x	x	x
Hearing aid outcome	IOI-HA		x	x
Hearing-related QoL transitional measure	Questionnaire		x	x

CPHI = Communication Profile for the Hearing Impaired, CPRS = Computerized Patient Record System, DSS = Decision Support System, EAR = Effectiveness of Aural Rehabilitation, HHIE = Hearing Handicap Inventory for the Elderly, IOI-HA = International Outcome Inventory - Hearing Aid, PHQ = Patient Health Questionnaire, QoL - quality of life, SADL = Satisfaction with Amplification in Daily Life, SF-12 = SF-12 Health Survey, SIC = Seattle Index of Co-morbidity