Fig. 1.

Negative binomial regression analysis of caregiver hours by agitation score –all patients. An IRR significantly different from 1 indicates caregiver hours differ significantly for different agitation scores; an IRR > 1 implies greater hours with higher agitation scores, an IRR < 1 implies fewer hours with higher agitation scores. All regressions were controlled for patient demographics (age and sex) and clinical characteristics (time since diagnosis, current MMSE score). Coef, coefficient; CI, confidence interval; IRR, incidence rate ratio; MMSE, Mini-Mental State Examination.