The Alzheimer's Disease Assessment Scale-Cognitive (ADAS-cog) subscale comprises 11 items summed to a total score ranging from 0 to 70, with lower scores indicating less severe impairment. A negative change indicates an improvement from baseline.

Intent to treat population double blind (ITT-DB): included all randomized patients who received at least 1 dose of double blind study drug, and had at least 1 post-randomization assessment for both co-primary efficacy variables: Alzheimer's Disease Assessment Scale-Cognitive and Disease Cooperative Study-Instrumental Activities of Daily Living.

The Alzheimer's Disease Cooperative Study-Instrumental Activities of Daily Living (ADCS-IADL) is a 16 item subscale of the caregiver-based ADCS-IADL scale, developed for the use in dementia studies. The ADCS-IADL total score ranges from 0 to 56, with higher scores indicating less severe impairment. A positive change indicates an improvement from baseline.

Intent to treat population double blind (ITT-DB): included all randomized patients who received at least 1 dose of double blind study drug, and had at least 1 post-randomization assessment for both co-primary efficacy variables: Alzheimer's Disease Assessment Scale-Cognitive and Disease Cooperative Study-Instrumental Activities of Daily Living.

Functional decline was defined by either an at least 1 point decrease in the Alzheimer's Disease Cooperative Study-Instrumental Activities of Daily Living (ADCS-IADL) subscale score in a visit and confirmed by the following visit/assessment or at least 2 points decrease from the double blind randomization baseline.

Intent to treat population double blind (ITT-DB): included all randomized patients who received at least 1 dose of double blind study drug, and had at least 1 post-randomization assessment for both co-primary efficacy variables: Alzheimer's Disease Assessment Scale-Cognitive and Disease Cooperative Study-Instrumental Activities of Daily Living.

Change from baseline to week 48 in total time to perform Trail Making Test (TMT) part A. This test provides information on visual search, scanning, speed of processing, mental flexibility, and executive functions. The TMT part A requires an individual to draw lines sequentially connecting 25 encircled numbers distributed on a sheet of paper. The score represents the amount of time required to complete the task. Total values for TMT part A range between 0 and 300 seconds. A negative change indicates an improvement from baseline.

Intent to treat population (ITT-DB): included all randomized patients with an assessment at baseline and week 48 who received at least 1 dose of double blind study drug, and had at least 1 post-randomization assessment for both co-primary efficacy variables (ADAS-cog and ADCS-IADL).

Change from baseline to week 48 in total time to perform Trail Making Test (TMT) part B. This test provides information on visual search, scanning, speed of processing, mental flexibility, and executive functions. TMT has two parts: Part A requires an individual to draw lines sequentially connecting 25 encircled numbers distributed on a sheet of paper. Task requirements are similar for TMT-Part B except the person must alternate between numbers and letters. Total values for TMT part B range between 0 and 420 seconds. A negative change from baseline indicates an improvement in condition.

Intent to treat population (ITT-DB): included all randomized patients with an assessment at baseline and week 48 who received at least 1 dose of double blind study drug, and had at least 1 post-randomization assessment for both co-primary efficacy variables (ADAS-cog, ADCS-IADL).

Change from baseline to week 48 as assessed by the Neuropsychiatric Inventory (NPI)-10 total score. The scale consists of 10 domains that are rated for both frequency (range 1-4) and severity (range 1-3). A composite score for each domain is calculated (frequency x severity) which ranges from 1 to 12. There is a leading question for each item. If the symptom is not present then the frequency, severity and distress scores are not completed. In this case the score is 0 for the item. The sum of the composite scores yields the NPI-10 total score (range 0-120). A negative change in score indicates an improvement from baseline (symptom reduction).

Intent to treat population double blind (ITT-DB): included all randomized patients with an assessment at baseline and week 48, who received at least 1 dose of double blind study drug, and had at least 1 post-randomization assessment for both co-primary efficacy variables (ADAS-cog, ADCS-IADL).

The safety set included all patients who received at least one dose of study medication and who had at least one post-baseline safety assessment.