ADAS-Cog13 (13-item version of ADAS-Cog) is a psychometric instrument that evaluates word recall, ability to follow commands, constructional praxis, naming, ideational praxis, orientation, word recognition, memory, comprehension of spoken language, word-finding, and language ability, with a measure of delayed word recall and concentration/ distractibility. The total score of the 13-item scale ranges from 0 to 85, with an increase in score indicating cognitive worsening. Least Squares (LS) mean was determined by mixed-model repeated measures (MMRM) model with factors for treatment, visit, treatment*visit, baseline efficacy score, baseline efficacy score-by-visit interaction, disease status at baseline, apolipoprotein E4 (APOE4) status, acetylcholinesterase inhibitor (AChEI) use at baseline, age at baseline, and pooled country.

All AZFD participants who received at least one dose of study drug and have baseline and at least one post-baseline data for ADAS-Cog13 measure. Feeder study AZES was stopped for futility, the original Delayed Start analysis was replaced with MMRM analysis and no comparisons between treatment groups were made.

The ADCS-ADL is a 23-item inventory developed as a rater-administered questionnaire answered by the participant's caregiver. The ADCS-ADL measures both basic and instrumental activities of daily living by participants. The range for the ADCS-iADL is 0-59 with higher scores reflecting better performance. LS Mean was determined by MMRM with factors for treatment, visit, treatment*visit, baseline efficacy score, baseline efficacy score-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, age at baseline, and pooled country.

All AZFD participants who received at least one dose of study drug and have baseline and at least one post-baseline data for ADCS-iADL measure.

FAQ is a 10-item, caregiver-questionnaire and was administered to the study partner and asked to rate the participant's ability to perform a variety of activities ranging from writing checks, assembling tax records, shopping, playing games, food preparation, traveling, keeping appointments, traveling out of neighborhood, keeping track of current events and understanding media. FAQ total score was calculated by adding the scores from each of the 10 items. Each activity is rated on a scale from 0 to 3 (Never did and would have difficulty now =1; Never did but could do now =0; Normal =0; Has difficulty but does by self =1; Requires assistance =2; Dependent =3). FAQ scale is 0 to 30, with higher scores indicating greater impairment. LS Mean was determined by MMRM with factors for treatment, visit, treatment*visit, baseline efficacy score, baseline efficacy score-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, age at baseline, and pooled country.

All AZFD participants who received at least one dose of study drug and have baseline and at least one post-baseline data for FAQ score.

The iADRS is a composite that measures both cognition and function. The iADRS comprises scores form the ADAS- Cog and the ADCS-iADL. The iADRS is calculated as a linear combination of the total scores of the ADAS-Cog13 (score range 0 to 85 with higher scores reflecting worse performance) and the ADCS-iADL (score range from 0-59 with higher scores reflecting better performance). The iADRS score ranges from 0 to 144 with higher scores indicating greater impairment. LS Mean was determined by MMRM with factors for treatment, visit, treatment*visit, baseline efficacy score, baseline efficacy score-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, age at baseline, and pooled country.

All AZFD participants who received at least one dose of study drug and have baseline and at least one post-baseline data for iADRS.

The MMSE is an instrument used to assess a participant's cognitive function. The MMSE assesses orientation to time and place, immediate and delayed recall of words, attention and calculation, language (naming, comprehension and repetition), and spatial ability (copying a figure). The range for MMSE total Score is 0 to 30, with a higher score indicating better cognitive performance. LS Mean was determined by MMRM methodology with factors for treatment, visit, treatment*visit, baseline efficacy score, baseline efficacy score-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, age at baseline, and pooled country.

All AZFD participants who received at least one dose of study drug and have baseline and at least one post-baseline data for MMSE.

ADAS-cog13 (13-item ADAS cog) is a psychometric instrument that evaluates word recall, ability to follow commands, constructional praxis, naming, ideational praxis, orientation, word recognition, memory, comprehension of spoken language, word-finding, and language ability, with a measure of delayed word recall and concentration/ distractibility. The total score of the 13-item scale ranges from 0 to 85, with an increase in score indicating cognitive worsening. Least Squares (LS) mean was determined by mixed-model repeated measures (MMRM) model with factors for treatment, visit, treatment*visit, baseline efficacy score, baseline efficacy score-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, age at baseline, and pooled country.

All AZFD participants who received at least one dose of study drug and have baseline and at least one post-baseline data for ADAS-Cog13 measure.