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Table 3 Estimated regression coefficients from the semiparametric models

From: Exploring the nonlinear relationship between body mass index and health-related quality of life among adults: a cross-sectional study in Shaanxi Province, China

 

Men

 

Women

Estimate

Std. Error

 

Estimate

Std. Error

Model 1 (Adj R2 = 0.114)

  

Model 1 (Adj R2 = 0.141)

  

Socio-demographic and physical activity

  

Socio-demographic and physical activity

  

Intercept

1.010**

0.00521

Intercept

1.005**

0.00610

BMI

Estimated with 6.753 edf, see left plot of Figure 1

BMI

Estimated with 6.791 edf, see left plot of Figure 2

Age

−0.0020**

0.00007

Age

−0.0021**

0.00007

Marital status

  

Marital status

  

 Unmarried(ref)

  

Unmarried(ref)

  

 Married

0.0249**

0.00308

Married

0.0192**

0.00436

 Divorced or widowed

−0.0026

0.00453

Divorced or widowed

−0.0154**

0.00541

Educational attainment

  

Educational attainment

  

 Illiteracy(ref)

  

Illiteracy(ref)

  

 Elementary

0.0141**

0.00304

Elementary

0.0283**

0.00248

 Middle school

0.0223**

0.00305

Middle school

0.0333**

0.00261

 High school

0.0241**

0.00354

High school

0.0342**

0.00349

 University

0.0248**

0.00471

University

0.0320**

0.00478

Residential areas

  

Residential areas

  

 Urban(ref)

  

Urban(ref)

  

 Rural

0.0001

0.00023

Rural

0.0002

0.00024

Economic status

  

Economic status

  

 Poorest(ref)

  

Poorest(ref)

  

 Poorer

0.0057*

0.00251

Poorer

0.0067*

0.00265

 Middle

0.0119**

0.00254

Middle

0.0107**

0.00265

 Richer

0.0093**

0.00261

Richer

0.0061*

0.00270

 Richest

0.0126**

0.00270

Richest

0.0066*

0.00278

Physical activity

  

Physical activity

  

 No(ref)

  

No(ref)

  

 Yes

0.0039*

0.00216

Yes

0.0130**

0.00207

Model 2 (Adj R2 = 0.149)

  

Model 2 (Adj R2 = 0.188)

  

Socio-demographic and physical activity

  

Socio-demographic and physical activity

  

Intercept

0.9979**

0.00519

Intercept

0.9975**

0.00603

BMI

Estimated with 6.693 edf, see right plot of Figure 1

BMI

Estimated with 6.750 edf,

see right plot of Figure 2

Age

−0.0016**

0.00007

Age

−0.0017**

0.00007

Marital status

  

Marital status

  

 Unmarried(ref)

  

Unmarried(ref)

  

 Married

0.0227**

0.00305

Married

0.0144**

0.00430

 Divorced or widowed

−0.0044

0.00448

Divorced or widowed

−0.0181**

0.00534

Educational attainment

  

Educational attainment

  

 Illiteracy(ref)

  

Illiteracy(ref)

  

 Elementary

0.0154**

0.00301

Elementary

0.0276**

0.00245

 Middle school

0.0238**

0.00302

Middle school

0.0320**

0.00257

 High school

0.0265**

0.00351

High school

0.0334**

0.00344

 University

0.0268**

0.00466

University

0.0308**

0.00471

Residential areas

  

Residential areas

  

 Urban(ref)

  

Urban(ref)

  

 Rural

−0.0001

0.00023

Rural

0.0001

0.00023

Economic status

  

Economic status

  

 Poorest(ref)

  

Poorest(ref)

  

 Poorer

0.0063*

0.00248

Poorer

0.0067*

0.00260

 Middle

0.0123**

0.00251

Middle

0.0104**

0.00261

 Richer

0.0096**

0.00258

Richer

0.0058*

0.00266

 Richest

0.0130**

0.00267

Richest

0.0061*

0.00274

Physical activity

  

Physical activity

  

 No(ref)

  

No(ref)

  

 Yes

0.0071**

0.00214

Yes

0.0147**

0.00205

Co-morbidities

  

Co-morbidities

  

 Hypertension

−0.0343**

0.00261

Hypertension

−0.0363**

0.00250

 Diabetes

−0.0387**

0.00534

Diabetes

−0.0253**

0.00523

 Heart problems

−0.0574**

0.00619

Heart problems

−0.0680**

0.00516

 Respiratory disease

−0.0588**

0.00626

Respiratory disease

−0.0340**

0.00752

 Musculoskeletal problems

−0.0821**

0.00441

Musculoskeletal problems

−0.0928**

0.00386

 Cancer

−0.1767**

0.02517

Cancer

−0.1577**

0.02098

  1. BMI Body mass index
  2. ref reference category
  3. edf effective degrees of freedom
  4. *P < 0.05; ** P < 0.01