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Table 3 Models for the duration of smoking and systolic blood pressure in the Han population

From: Relationship between the duration of smoking and blood pressure in Han and ethnic minority populations: a cross-sectional study in China

Model

Estimate

95% CI

P

Linear model

 Model 1

  Duration of smoking

0.302

0.271, 0.334

< 0.001

 Model 2

  Duration of smoking

0.318

0.287, 0.349

<  0.001

  Sex (male vs. female)

2.548

0.685, 4.411

0.007

  Quit vs. never drink

1.787

0.351, 3.223

0.015

  Current vs. never drink

2.498

1.570, 3.427

<  0.001

  BMI

0.831

0.725, 0.936

<  0.001

  Moderate vs. light physical activity

−2.707

−3.762, −1.651

<  0.001

  Heavy vs. light physical activity

−2.570

−3.548, − 1.593

<  0.001

 Model 3

  Duration of smoking

0.283

0.252, 0.314

<  0.001

  Sex (male vs. female)

3.195

1.343, 5.047

0.001

  Quit vs. never drink

1.276

−0.151, 2.704

0.080

  Current vs. never drink

2.359

1.438, 3.280

<  0.001

  BMI

0.752

0.646, 0.857

<  0.001

  Moderate vs. light physical activity

−2.476

−3.523, -1.429

<  0.001

  Heavy vs. light physical activity

−2.144

−3.115, −1.172

<  0.001

  LDL-C

1.597

1.149, 2.045

<  0.001

  FPG

1.184

0.921, 1.446

<  0.001

Spline model

 Model 4 a

  Duration of smoking (linear)

0.118

0.043, 0.193

0.002

  Duration of smoking (non-linear)

0.234

0.147, 0.320

<  0.001

Segmented model

 Model 5a

  Threshold of duration of smoking

46.006

43.594, 48.418

–

  Duration of smoking (shorter than 46.006 years)

0.256

0.220, 0.292

<  0.001

  Duration of smoking (longer than 46.006 years)

1.262

0.869, 1.655

–

  1. Abbreviations: CI Confidence interval, BMI Body mass index, LDL-C Low-density lipoprotein cholesterol, FPG Fasting plasma glucose
  2. a Crude model