Table 5.

Multivariable Relationships Between Study Design Features and Number of Contact Attempts to Nonrespondents Controlling for Respondent and Facility Characteristics

Characteristic	Parameter Estimate	Standard Error	t Value	p Value
Intercept	6.98	0.71	9.77	<.0001
Design feature
Data collection mode
Mailed questionnaire	−0.96	0.39	−2.47	.01
Web-based questionnaire	Reference
Length of survey
Short (5–10 min)	−0.28	0.39	−0.72	.47
Long (20–30 min)	Reference
Incentivea
$30/$5/$35	−I.I4	0.55	−2.06	.04
$I0/$25/$35	−0.72	0.55	−1.31	.I9
$30/$20/$50	−1.07	0.54	−I.98	.04
$I0/$40/$50	Reference
Respondent characteristics
Type of respondent
Administrator	−0.21	0.39	−0.55	.58
Director of nursing	Reference
Facility characteristics
Type of facility
Free-standing, for-profit	−0.28	0.58	−0.49	.63
Free-standing, nonprofit	−0.07	0.58	−0.12	.91
Hospital based	Reference
Size of facility
Small	−0.12	0.39	−0.31	.76
Large	Reference
Percent of non-White residents in facility
≤10%	−0.55	0.39	−I.44	.I5
>10%	Reference