Table 3 Adjusted odds ratios and 95% confidence intervals of the variables associated with having < 20 teeth^a

Age

80–84

Reference

Reference

85–89

1.190

0.821

1.724

0.358

1.199

0.824

1.746

0.342

90–94

1.923

1.323

2.794

 < 0.001

1.383

0.894

2.14

0.145

95–99

2.739

1.539

4.876

 < 0.001

2.022

1.084

3.773

0.027

≥100

2.780

1.354

5.709

0.005

3.088

1.718

5.549

 < 0.001

Household income per capita

Q1

Reference

Reference

Q2

0.930

0.496

1.741

0.820

1.193

0.675

2.106

0.543

Q3

0.656

0.37

1.161

0.148

0.814

0.485

1.363

0.433

Q4

0.602

0.339

1.069

0.083

0.664

0.381

1.157

0.148

Q5

0.557

0.315

0.986

0.045

0.691

0.41

1.164

0.165

Current residence area

Rural (Ref. Urban)

1.418

0.961

2.093

0.079

0.985

0.665

1.46

0.940

Marital status

Unmarried (Ref. Married)

1.061

0.750

1.500

0.738

1.209

0.823

1.777

0.334

Illiterate

Yes (Ref. No)

1.156

0.772

1.732

0.480

0.944

0.645

1.382

0.767

Brushing less than once per day

Yes (Ref. No)

1.346

0.887

2.043

0.163

1.957

1.263

3.034

0.003

Green tea consumption

Less than once per month

Reference

Reference

Some of the time

1.500

0.52

4.328

0.453

0.725

0.231

2.278

0.582

Almost everyday

0.804

0.495

1.304

0.376

1.225

0.638

2.352

0.541

Mushroom consumption

Less than once per month

Reference

Reference

Some of the time

1.062

0.722

1.561

0.760

1.143

0.762

1.715

0.519

Almost everyday

1.285

0.48

3.439

0.617

0.951

0.316

2.86

0.929

Fish consumption

Less than once per month

Reference

Reference

Some of the time

0.970

0.651

1.446

0.883

0.939

0.637

1.383

0.749

Almost everyday

0.795

0.414

1.525

0.489

1.572

0.818

3.02

0.174

Milk consumption

Less than once per month

Reference

Reference

Some of the time

0.697

0.452

1.075

0.102

0.970

0.632

1.489

0.889

Almost everyday

0.733

0.442

1.216

0.229

0.683

0.411

1.137

0.142

Sugar consumption

Less than once per month

Reference

Reference

Some of the time

1.245

0.853

1.816

0.256

1.739

1.154

2.619

0.008

Almost everyday

0.627

0.353

1.114

0.111

0.947

0.528

1.7

0.855

Alcohol consumption

Never drink

Reference

Reference

Drank in the past

1.166

0.645

2.109

0.611

0.540

0.17

1.713

0.295

Drink at present

0.901

0.51

1.593

0.720

1.356

0.291

6.323

0.698

Cigarette smoking

Never smoked

Reference

Reference

Former smoker

1.116

0.753

1.656

0.584

1.609

0.695

3.726

0.267

Current smoker

1.504

0.948

2.387

0.083

0.779

0.356

1.707

0.533

ADL capacity

Disabled (Ref. Not disabled)

1.710

1.011

2.891

0.045

1.696

1.039

2.768

0.035

Hypertension

Yes (Ref. No)

0.936

0.66

1.327

0.710

1.066

0.745

1.526

0.726

Diabetes

Yes (Ref. No)

1.015

0.61

1.691

0.953

0.720

0.436

1.19

0.200

Overweight (BMI ≥ 25)

Yes (Ref. No)

0.820

0.55

1.225

0.083

0.734

0.497

1.085

0.121