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Table 3 Fixed effects of the mixed model for the Neuro-Psychological Battery

From: For debate: substituting placebo controls in long-term Alzheimer's prevention trials

Fixed effects

Value

Standard error

Degrees of freedom

t value

P value

Intercept

0.92879

0.22683

1,065

4.095

< 0.0001

BMI-2 (category 25 to 30 kg/m2)

-0.06911

0.03812

366

-1.813

0.0706

BMI-3 (category >30 kg/m2)

-0.04498

0.05337

366

-0.843

0.3999

Visit number

0.01241

0.02184

1,065

0.568

0.5701

Apolipoprotein E4

0.03383

0.02608

366

1.298

0.1953

Age

-0.00887

0.00292

366

-3.040

0.0025

FAQ at baseline

-0.11273

0.03835

366

-2.939

0.0035

ADAScog at baseline

-0.00299

0.00339

366

-0.882

0.3782

NP-Batt at baseline

0.97529

0.03019

366

32.303

<0.0001

(BMI-2) Ă— Visit number

0.02130

0.01366

1,065

1.559

0.1192

(BMI-3) Ă— Visit number

0.05513

0.02003

1,065

2.752

0.0060

Visit number Ă— apolipoprotein E

-0.03558

0.00932

1,065

-3.818

0.0001

Visit number Ă— ADAScog

-0.00557

0.00104

1,065

-5.374

<0.0001

Age Ă— FAQ

0.00140

0.00051

366

2.723

0.0068

  1. Standard deviation (residuals) = 0.2175. ADAScog, Alzheimer Disease Assessment Scale - cognitive subscale; BMI, body mass index; FAQ, Functional Assessment Questionnaire; NP-Batt, Neuro-Psychological Battery.