Table 4 Multivariate logistic regression of the participants’ characteristics to having adequate knowledge of vitamin D

Age groups

18–28

Ref

29–39

0.039

1.520

1.022

2.259

40–50

0.002

2.264

1.336

3.837

51–60

0.054

2.214

0.987

4.966

More than 60

0.012

7.956

1.575

40.180

Gender

Female

Ref

Male

0.613

1.082

0.797

1.469

Living location

Countryside

Ref

City

0.262

0.865

0.671

1.115

Marital status

Single

Ref

Married

0.783

1.072

0.655

1.754

Widowed

0.696

0.804

0.269

2.406

Divorced

0.733

0.848

0.329

2.184

Level of education

Illiterate

Ref

Primary school

0.275

2.690

0.455

15.922

Middle school

0.752

1.256

0.306

5.153

secondary school

0.204

2.393

0.623

9.198

University

0.210

2.344

0.618

8.888

PhD

0.062

4.092

0.930

18.007

Monthly income

High

Ref

Good

0.737

0.847

0.321

2.236

Middle

0.976

1.015

0.387

2.664

Low

0.982

0.988

0.341

2.860

Occupation

Public sector

Ref

Student

0.313

1.271

0.798

2.025

Private Job

0.510

0.865

0.563

1.331

Retired

0.134

0.494

0.196

1.244

Non-working

0.212

0.737

0.456

1.191

Other

0.464

1.291

0.652

2.554

Chronic diseases

No

Ref

Yes

0.695

1.109

0.662

1.858

Have children

No

Ref

Yes

0.443

1.217

0.736

2.012