Change from baseline to Week 24 in Alzheimer's Disease Assessment Scale-cognitive subscale (ADAS-cog) total score.

The Alzheimer's Disease Assessment Scale - Cognitive subscale (ADAS-cog) is a 11-item neuropsychological test that assess the severity of cognitive impairment. The items determine the patient's orientation, memory, language, and praxis. Total score of the 11 items range from 0 to 70 (lower score indicates lower cognitive impairment).

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.

Alzheimer's Disease Cooperative Study - Clinical Global Impression of Change (ADCS-CGIC) score at Week 24.

The Alzheimer's Disease Cooperative Study - Clinical Global Impression of Change is a semi-structured interview to assess clinically relevant changes in patients with AD. The items determine cognition, behavior, social and daily functioning. Severity at baseline is rated on a 7-point scale from 1 (normal, not ill at all) to 7 (among the most extremely ill patients). The clinically relevant change from baseline is rated on a 7-point scale from 1 (marked improvement) to 7 (marked worsening).

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.

Change from baseline to Week 24 in Alzheimer's Disease Cooperative Study - Activities of Daily Living Inventory (ADCS-ADL23) total score.

The Alzheimer's Disease Cooperative Study - Activities of Daily Living (ADCS-ADL23) is a 23-item clinician-rated inventory to assess activities of daily living (conducted with a caregiver or informant). Each item comprises a series of hierarchical sub-questions, ranging from the highest level of independent performance to a complete loss for each activity. Total score of the 23 items ranges from 0 to 78 (higher score indicates lower disability).

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.

Change from baseline to Week 24 in Neuropsychiatric Inventory (NPI) total score

The Neuropsychiatric Inventory is a 12-item structured interview with a caregiver to assess behavioural disturbances. The NPI comprises 10 behavioural and 2 neurovegetative items. Each item consists of a screening question and several sub-questions that are rated no (not present) or yes (present). Each item is then rated for frequency (a 4-point scale from 1 [occasionally] to 4 [very frequent]) and severity (a 3-point scale from 1 [mild] to 3 [marked]). The total NPI score is the frequency ratings multiplied by the severity ratings and ranges from 0 to 144 (higher score indicates worse outcome).

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.

Change in single NPI item scores at Week 24.

The Neuropsychiatric Inventory is a 12-item structured interview with a caregiver to assess behavioural disturbances. The NPI comprises 10 behavioural and 2 neurovegetative items. Each item consists of a screening question and several sub-questions that are rated no (not present) or yes (present). Each item is then rated for frequency (a 4-point scale from 1 [occasionally] to 4 [very frequent]) and severity (a 3-point scale from 1 [mild] to 3 [marked]). Total score for each single NPI item ranges from 0-12 (frequency multiplied by severity), where higher scores represent worse outcome.

All patients who took at least one dose of placebo or idalopirdine and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure/item assessed

Change from baseline to Week 24 in NPI anxiety item score in patients with an NPI anxiety item score of at least 2 at baseline

The Neuropsychiatric Inventory is a 12-item structured interview with a caregiver to assess behavioural disturbances. The NPI comprises 10 behavioural and 2 neurovegetative items. Each item consists of a screening question and several sub-questions that are rated no (not present) or yes (present). Each item is then rated for frequency (a 4-point scale from 1 [occasionally] to 4 [very frequent]) and severity (a 3-point scale from 1 [mild] to 3 [marked]). The total score for the NPI anxiety item ranges from 0-12 (frequency multiplied by severity), where a higher score represents a worse outcome.

All patients who took at least one dose of placebo or idalopirdine and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome/item measure assessed

Clinical response at Week 24 (based on pre-specified ADAS-cog, ADCS-ADL23, and ADCS-CGIC changes [change in ADAS-cog below or equal to -4, change in ADCS-ADL23 at least 0, and ADCS-CGIC below or equal to 4])

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.

Clinical worsening at Week 24 (Based on pre-specified ADAS-cog, ADCS-ADL23, and ADCS-CGIC changes [change in ADAS-cog above or equal to 4, change in ADCS-ADL23 below 0, and ADCS-CGIC above 4])

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.

Change from baseline to Week 24 in Mini Mental State Examination (MMSE).

The Mini Mental State Examination (MMSE) is an 11-item test to assess the cognitive aspects of mental function. The subtests assess orientation, memory, attention, language, and visual construction. The scores for each item is dichotomous (1 = response is correct, 0 = response is incorrect). Total score of the 11 items ranges from 0 to 30 (higher score indicates lower deficit).

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.

Change from baseline to Week 24 in EuroQol 5-dimensional (EQ-5D) utility score

The EQ-5D is a patient-reported assessment that measures the patient's well-being. It consists of an utility score based on 5 descriptive items (mobility, self-care, usual activities, pain/discomfort, and depression/anxiety) and a Visual Analogue Scale (VAS). Each descriptive item is rated on a 3-point index ranging from 1 (no problems) to 3 (extreme problems) that is used for calculating a single summary index (from 0 to 1). A higher EQ-5D score indicates a worse outcome.

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.

Change from baseline to Week 24 in EQ-5D Visual Analogue Scale (EQ-5D VAS).

The EQ-5D is a patient-reported assessment that measures the patient's well-being. It consists of an utility score based on 5 descriptive items (mobility, self-care, usual activities, pain/discomfort, and depression/anxiety) and a Visual Analogue Scale (VAS). The VAS ranges from 0 (worst imaginable health state) to 100 (best imaginable health state).

All patients who took at least one dose of placebo or idalopirdine, and who had a valid baseline assessment and at least one valid post-baseline assessment of the primary outcome measure in the 24-week treatment period (Full-analysis Set). For secondary outcome measures, the number of participants who had the respective outcome measure assessed.