Table 5 Results of multiple linear regression analyses for the associations between protein intake categories and cognition in old adults with no decrease in food intake over the past 3 months (n = 182)

Overall

Model 1^a

 High

0.243

< 0.001

0.192

< 0.001

0.120

0.107

 Medium

0.083

0.142

0.032

0.521

0.071

0.319

 Low

-

-

-

Model 2^b

 High

0.218

< 0.001

0.161

0.002

0.085

0.259

 Medium

0.068

0.276

0.002

0.970

0.045

0.528

 Low

-

-

-

APOE4-positive

Model 1^c

 High

0.483

0.002

0.510

< 0.001

0.323

0.081

 Medium

0.112

0.392

0.091

0.473

0.125

0.445

 Low

-

-

-

Model 2^d

 High

0.401

0.017

0.442

0.014

0.233

0.161

 Medium

-0.017

0.909

-0.001

0.993

-0.043

0.783

 Low

-

-

-

APOE4-negative

Model 1^c

 High

0.154

0.015

0.081

0.113

0.031

0.703

 Medium

0.029

0.635

-0.033

0.509

0.020

0.796

 Low

-

-

-

Model 2^d

 High

0.144

0.028

0.064

0.221

0.012

0.881

 Medium

0.033

0.595

-0.034

0.494

0.022

0.785

 Low

-

-

-