Table 3.

Random Effect Model of Utilization and Costs of Informal Caregiving

	Utilization Rates per Patient (n = 170)		Average Hours per Week per User (n = 152)

Variable	Coefficient (Standard Error)	Odds Ratio	Coefficient (Standard Error)
Year	0.148 (0.150)	0.862	0.099 (0.037)^†
Mini-Mental State Examination score	0.094 (0.047)^*	0.910	0.011 (0.009)
Blessed Dementia Rating Scale score	0.295 (0.106)^†	1.343	0.054 (0.020)^†
Number of comorbidities	0.622 (0.253)^*	1.862	0.017 (0.047)
Behavioral problems (1 = present, 0 = absent)	0.044 (0.392)	0.957	0.017 (0.090)
Extrapyramidal signs (1 = present, 0 = absent)	0.101 (0.531)	0.904	0.045 (0.113)
Depressive symptoms (1 = present, 0 = absent)	0.539 (0.444)	0.584	0.160 (0.109)
Psychotic symptoms (1 = present, 0 = absent)	0.760 (0.439)	0.467	0.128 (0.093)
Women (1 = yes, 0 = no)	0.369 (0.438)	0.691	0.056 (0.094)
Aged <65 (1 = yes, 0 = no)	0.466 (0.647)	1.594	0.102 (0.128)
Marital status (reference = other)
Married (1 = yes, 0 = 0)	1.316 (0.768)	3.728	0.212 (0.197)
Widowed (1 = yes, 0 = 0)	0.941 (0.710)	2.563	0.078 (0.190)
Site (reference = Columbia)
Johns Hopkins	1.957 (1.794)	7.078	0.300 (0.209)
Massachusetts General Hospital	0.171 (0.431)	0.843	0.466 (0.300)
Constant	1.847 (1.450)		9.894 (0.326)^†
Total number of observations	409		306
Log likelihood	−158.5		−315.6

.05,

^†

.01.