Table 2 Multivariable logistic regression analysis results for cognitive impairment

  Male

–

–

–

–

–

–

  Female

1.257

0.085

3.39

0.001

1.101

1.434

  65 ~ 74

–

–

–

–

–

–

  75 ~ 84

2.986

0.557

5.87

<  0.001

2.072

4.303

   ≥ 85

20.486

3.609

17.14

<  0.001

14.505

28.935

  Separated/divorced/widowed/never married

–

–

–

–

–

–

  Currently married and living with a spouse

0.690

0.099

−2.59

0.009

0.521

0.913

  Urban/Town

–

–

–

–

–

–

  Rural

0.996

0.059

−0.07

0.946

0.887

1.119

  No schooling

–

–

–

–

–

–

  Primary school

0.678

0.051

−5.13

<  0.001

0.585

0.787

  Middle school or more

1.223

0.142

1.74

0.082

0.975

1.535

  non-white-collar

–

–

–

–

–

–

  white-collar

0.738

0.090

−2.49

0.013

0.580

0.937

  1 (poorest)

–

–

–

–

–

–

  2

0.861

0.078

−1.65

0.099

0.722

1.028

  3

0.812

0.075

−2.27

0.023

0.678

0.972

  4

0.771

0.073

−2.74

0.006

0.640

0.929

  5 (richest)

0.577

0.057

−5.55

<  0.001

0.475

0.701

  Nobody

–

–

–

–

–

–

  Relatives/friends/neighbors and others

0.219

0.039

−8.48

<  0.001

0.154

0.311

  Children

0.400

0.063

−5.78

<  0.001

0.293

0.546

  Spouse

0.242

0.051

−6.71

<  0.001

0.160

0.366

  No

–

–

–

–

–

–

  Yes

0.712

0.044

−5.45

<  0.001

0.630

0.804

  Alone

–

–

–

–

–

–

  In an institution

3.374

0.569

7.22

<  0.001

2.425

4.695

  With household member(s)

2.227

0.201

8.87

<  0.001

1.866

2.658

  No

–

–

–

–

–

–

  Yes

1.065

0.089

0.76

0.449

0.905

1.253

  No

–

–

–

–

–

–

  Yes

0.872

0.050

−2.30

0.021

0.776

0.980