The association between caregiver burden, distress, psychiatric morbidity and healthcare utilization among persons with dementia in Singapore

Table 3 Results from the negative binomial regression analyses of variables associated with length of hospital stay and number of outpatient visits within the last 3 months

	Length of Hospital Stay^a			Number of outpatient visits^b
	I.R.R	95% CI	p	I.R.R	95% CI	p
Caregiver burden (ZBI)	1.03	1.00–1.05	0.02	1.01	0.99–1.01	0.06
Psychiatric morbidity of caregiver (SRQ-20)^a	0.98	0.87–1.09	0.66
Multimorbidity of PWD^b
No multimorbidity				ref
Has Multimorbidity				1.52	1.20–1.93	0.001

Variables included in final logistic regression model were determined by a series of univariate Kruskal-wallis and negative binomial analyses (Additional file 1: Appendix)
^aPsychiatric morbidity of caregiver was not included in the final negative binomial model for number of outpatient visits as it was not a significant correlate at the univariate level
^bMultimorbidity of PWD was not included in the final negative binomial model for number of outpatient visits as it was not a significant correlate at the univariate level
I.R.R Incidence rate ratio, 95% CI 95% confidence interval of incidence rate ratio
Bold print highlights statistically significant incidence rate ratios

ISSN: 1471-2318