Table 2 Risk factors associated with prehypertension

 Male

1.917

1.833–2.005

2.076

1.952–2.208

 Female

1.0 (Ref.)

1.0 (Ref.)

 18–29

1.0 (Ref.)

1.0 (Ref.)

 30–39

1.470

1.383–1.563

1.201

1.090–1.322

 40–49

2.171

2.042–2.308

1.607

1.456–1.773

 50–59

3.045

2.835–3.270

2.081

1.868–2.319

 60–69

3.847

3.515–4.210

2.498

2.204–2.831

 70–79

4.456

3.922–5.063

2.948

2.514–3.457

 Married

1.0 (Ref.)

1.0 (Ref.)

 Single

0.463

0.441–0.486

0.928

0.844–1.020

 Divorced/widowed

1.188

1.061–1.331

1.003

0.888–1.134

 Illiterate or primary school

1.0 (Ref.)

1.0 (Ref.)

 High school

0.763

0.715–0.814

0.919

0.851–0.992

 University

0.464

0.434–0.495

0.687

0.627–0.752

 Physical laborer

1.0 (Ref.)

1.0 (Ref.)

 Laborer with mental work

0.644

0.617–0.673

1.084

1.020–1.152

 Han

1.0 (Ref.)

1.0 (Ref.)

 Yi

1.129

1.026–1.244

1.347

1.210–1.500

 Miao

0.926

0.776–1.106

0.753

0.623–0.910

 Mongolia

1.065

0.949–1.196

1.042

0.920–1.179

 Tibetan

0.541

0.465–0.629

0.521

0.442–0.613

 Korean

1.231

1.078–1.406

0.965

0.837–1.111

 Hui

1.001

0.911–1.100

1.133

1.024–1.253

 Tujia

0.866

0.759–0.988

0.779

0.677–0.898

 Others

0.682

0.589–0.791

0.974

0.832–1.140

 Never

1.0 (Ref.)

1.0 (Ref.)

 Current

1.575

1.492–1.662

0.741

0.688–0.798

 Former

1.558

1.028–2.361

0.825

0.530–1.285

 No

1.0 (Ref.)

1.0 (Ref.)

 Yes

1.619

1.535–1.709

1.147

1.072–1.228

 No

1.0 (Ref.)

1.0 (Ref.)

 Yes

1.039

0.968–1.116

0.977

0.905–1.055

 General obesity

4.180

3.785

2.460

2.190–2.763

 Overweight

2.470

2.346

1.667

1.563–1.788

 Normal

1.0 (Ref.)

1.0 (Ref.)

 Yes

2.734

2.601–2.873

1.371

1.280–1.467

 No

1.0 (Ref.)

1.0 (Ref.)

 No

1.0 (Ref.)

1.0 (Ref.)

 Yes

1.172

1.089–1.262

1.132

1.045–1.226