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Table 2 Models for the duration of smoking and systolic blood pressure in the whole 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

0.339

0.311, 0.368

<  0.001

 Model 2

  Duration of smoking

0.352

0.323, 0.380

<  0.001

  Sex (male vs. female)

1.700

−0.160, 3.560

0.073

  Quit vs. never drink

1.147

−0.162, 2.456

0.086

  Current vs. never drink

3.084

2.209, 3.959

<  0.001

  BMI

0.701

0.605, 0.797

<  0.001

  Moderate vs. light physical activity

−3.164

−4.171, − 2.157

<  0.001

  Heavy vs. light physical activity

−0.742

−1.602, 0.119

0.091

 Model 3

  Duration of smoking

0.325

0.296, 0.354

<  0.001

  Sex (male vs. female)

2.117

0.265, 3.968

0.025

  Quit vs. never drink

0.695

−0.608, 1.998

0.296

  Current vs. never drink

3.011

2.141, 3.881

<  0.001

  BMI

0.637

0.541, 0.733

<  0.001

  Moderate vs. light physical activity

−2.929

−3.931, −1.928

<  0.001

  Heavy vs. light physical activity

−0.240

−1.099, 0.620

0.585

  LDL-C

1.188

0.768, 1.608

<  0.001

  FPG

1.165

0.916, 1.414

<  0.001

Spline model

 Model 4 a

  Duration of smoking (linear)

0.136

0.066, 0.205

<  0.001

  Duration of smoking (non-linear)

0.254

0.175, 0.333

<  0.001

Segmented model

 Model 5a

  Threshold of duration of smoking

37.694

34.185, 41.202

–

  Duration of smoking (shorter than 37.694 years)

0.261

0.218, 0.304

<  0.001

  Duration of smoking (longer than 37.694 years)

0.696

0.543, 0.849

–

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