Skip to main content

Table 2 Adjusted medians for 24-h excreted urinary metabolites [mg] according to the consumption frequencies of caffeinated coffee, other caffeinated beverages and decaffeinated coffee (quantile regression)

From: Relation of 24-hour urinary caffeine and caffeine metabolite excretions with self-reported consumption of coffee and other caffeinated beverages in the general population

 

Never

1–4×/Month

1–4×/Week

5×/Week

> = 1×/day

P for trenda

ρ c

P d

Adjusted medians for 24-h urinary caffeine [mg] (winsorised 99th percentile)

 Caffeinated coffee

  Unadjusted model

0.791

1.270

1.890

2.469

3.612

<0.001

0.473

<0.001

 Fully adjusted modelb

1.382

1.655

2.262

2.959

3.724

<0.001

  

 Other caffeinated drinks

  Unadjusted model

3.144

3.116

2.521

1.787

2.954

0.578

−0.069

0.090

  Fully adjusted modelb

3.419

3.285

3.034

1.899

3.268

0.702

  

 Decaffeinated coffee

  Unadjusted model

2.694

2.842

2.787

6.576

3.128

0.374

0.039

0.346

  Fully adjusted modelb

3.273

2.929

3.022

4.586

3.032

0.612

  

Adjusted medians for 24-h urinary paraxanthine [mg] (win. 99th perc.)

 Caffeinated coffee

  Unadjusted model

2.331

4.269

6.833

6.923

12.512

<0.001

0.528

<0.001

  Fully adjusted modelb

3.847

4.287

7.174

8.755

12.456

<0.001

  

 Other caffeinated drinks

  Unadjusted model

12.361

9.993

8.706

8.361

10.706

0.469

−0.061

0.133

  Fully adjusted modelb

12.781

10.506

9.368

8.533

11.150

0.185

  

 Decaffeinated coffee

  Unadjusted model

9.875

9.571

9.500

17.852

11.407

0.324

0.057

0.164

  Fully adjusted modelb

10.498

10.271

10.188

11.503

11.829

0.494

  

Adjusted medians for 24-h urinary theophylline [mg] (win. 99th perc.)

 Caffeinated coffee

  Unadjusted model

0.266

0.353

0.660

0.689

1.163

<0.001

0.519

<0.001

  Fully adjusted modelb

0.347

0.396

0.603

0.835

1.145

<0.001

  

 Other caffeinated drinks

  Unadjusted model

1.036

1.007

0.734

0.724

0.935

0.093

−0.075

0.069

  Fully adjusted modelb

1.100

0.982

0.842

0.684

0.965

0.519

  

 Decaffeinated coffee

  Unadjusted model

0.870

1.034

0.683

1.406

1.081

0.155

0.040

0.329

  Fully adjusted modelb

0.933

0.901

0.749

1.563

0.923

0.972

  

Adjusted medians for 24-h urinary theobromine [mg] (win. 99th perc.)

 Caffeinated coffee

  Unadjusted model

11.352

12.911

13.743

11.747

10.977

0.398

−0.019

0.637

  Fully adjusted modelb

10.361

11.231

13.992

11.286

11.949

0.726

  

 Other caffeinated drinks

  Unadjusted model

11.900

10.287

11.456

10.904

11.623

0.870

0.013

0.746

  Fully adjusted modelb

13.256

11.203

10.854

9.342

13.351

0.472

  

 Decaffeinated coffee

  Unadjusted model

10.889

12.125

11.773

11.097

12.369

0.445

0.045

0.271

  Fully adjusted modelb

11.588

12.635

11.056

9.516

14.604

0.178

  
  1. a P-value for linear trend (Reported consumption frequency: lowest vs. highest)
  2. bModel was adjusted for age, sex, BMI, urinary creatinine, glomerular filtration rate, urinary volume, urinary flow, study center, smoking and alcohol status
  3. cSpearman correlation coefficient (ρ) for the association between self-reported consumption frequency and 24-h urinary excretion
  4. dSpearman correlation coefficient associated p-value
Back to article page

Nutrition & Metabolism

ISSN: 1743-7075

Contact us