The difference in reduction from baseline between THC and placebo was not significant ( mean difference NPItotal : @ , @ % confidence interval -LSB- CI -RSB- -@ to @ ) , nor were changes in scores for agitation ( Cohen-Mansfield Agitation Inventory @ , @ % CI -@ to @ ) , quality of life ( Quality of Life-Alzheimer 's Disease -@ , @ % CI -@ to @ ) , or activities of daily living ( Barthel Index @ , @ % CI -@ to @ ) .