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Table 3 Spearman correlation coefficients between exposure variables (daily lag0) in Gothenburg, Sweden during the entire year, warm and cold periods (1 January 1985–31 December 2010)

From: The effect of secondary inorganic aerosols, soot and the geographical origin of air mass on acute myocardial infarction hospitalisations in Gothenburg, Sweden during 1985–2010: a case-crossover study

Entire year

Temp

PM10

PMion

PMrest

SO4 2−

Total NO3 −1

Total NH4 +

PM2.5

Soot

Rel. hum

−0.331

−0.127

0.217

−0.272

0.208

0.280

0.134

0.115

0.235

 

8859a

7445

8139

7089

8622

8255

8311

1778

8588

Temp

 

0.003b

0.130

−0.033

0.082

0.115

0.179

−0.026

−298

  

7482

8473

7115

9097

8619

8667

1778b

9038

PM 10

  

0.459

0.803

0.346

0.321

0.338

0.567

0.284

   

7123

7123

7281

7212

7247

1773

7268

PM ion

   

−0.059

0.877

0.833

0.862

0.615

0.535

    

7123

8597

8597

8597

1744

8411

PM rest

    

−0.111

−0.144

−0.129

0.289

0.022b

     

7123

7123

7123

1739

6976

SO 4 2−

     

0.625

0.770

0.613

0.569

      

8677

8724

1749

9025

Total NO 3 −1

      

0.761

0.500

0.377

       

8669

1747

8509

Total NH 4 +

       

0.586

0.540

        

1747

8564

PM 2.5

        

0.479

         

1752

Warm period

Temp

PM 10

PM ion

PM rest

SO 4 2−

Total NO 3 −1

Total NH 4 +

PM 2.5

Soot

Rel. hum

−0.161

−0.157

0.169

−0.306

0.189

0.219

0.104

0.005b

0.019b

 

4454

3781

4139

3648

4342

4206

4214

913

4305

Temp

 

0.109

0.148

0.088

0.167

0.090

0.135

0.191

−0.057

  

3781

4290

3648

4589

4372

4384

913

4546

PM 10

  

0.547

0.805

0.423

0.405

0.471

0.620

0.339

   

3652

3652

3692

3694

3697

911

3673

PM ion

   

0.033

0.887

0.857

0.871

0.697

0.502

    

3652

4325

4325

4325

896

4219

PM rest

    

−0.030b

−0.059

0.012

0.323

0.124

     

3652

3652

3652

894

3568

SO 4 2−

     

0.665

0.788

0.657

0.548

      

4362

4374

899

4514

Total NO 3 −1

      

0.745

0.611

0.325

       

4373

898

4271

Total NH 4 +

       

0.696

0.551

        

897

4286

PM 2.5

        

0.424

         

895

Cold period

Temp

PM 10

PM ion

PM rest

SO 4 2−

Total NO 3 −1

Total NH 4 +

PM 2.5

Soot

Rel. hum

0.183

−0.170

0.325

−0.332

0.239

0.410

0.298

0.142

0.158

 

4405a

3664

4000

3441

4280

4049

4097

865

4283

Temp

 

0.054

0.215

−0.068

0.138

0.262

0.140

0.011b

−0.120

  

3701

4183

3467

4508

4247

4283

865

4492

Warm period

Temp

PM 10

PM ion

PM rest

SO 4 2−

Total NO 3 −1

Total NH 4 +

PM 2.5

Soot

PM 10

  

0.381

0.801

0.275

0.248

0.239

0.516

0.238

   

3471

3471

3589

3518

3550

862

3595

PM ion

   

−0.140

0.869

0.815

0.864

0.567

0.630

    

3471

4272

4272

4272

848

4192

PM rest

    

−0.187

−0.218

−0.240

0.251

−0.084

     

3471

3471

3471

845

3408

SO 4 2−

     

0.592

0.769

0.581

0.644

      

4315

4350

850

4511

Total NO 3 −1

      

0.784

0.429

0.458

       

4296

849

4238

Total NH 4 +

       

0.564

0.664

        

850

4278

PM 2.5

        

0.518

         

857

  1. aNumber of days less than 9496 in the entire year, 4758 in the warm and 4738 in the cold period due to missing exposure data.
  2. bp-value ≥ 0.05, otherwise p-value > 0.05.
  3. Warm period: April − September, cold period: October − March.
  4. PM10 and PMrest available from 1990–2010 and PM2.5 available from 2006–2010.