Table 1 Clinical characteristics of the 104 IgA nephropathy patients. Values are medians (interquartile range) unless otherwise indicated

Number of subjects

48

56

Current age, years

52 (37–58)

59 (51–70)

< 0.001

Current body mass index, kg/m²

27 (24–32)

29 (27–33)

0.048

Current smoker, %

19

7

0.135

Risky alcohol use^a, %

23

29

0.654

Coexisting conditions, %

  Hypertension

40

63

0.030

  Diabetes

8

16

0.373

  Asthma or chronic obstructive pulmonary disease

17

14

0.790

  Sleep apnoea

10

10

1.000

  Rheumatic disease

13

7

0.507

  Thyroid disease

21

4

0.011

  Cancer; active or treated

6

2

0.333

  Depression

10

5

0.334

Medication during the year before the study, %

  Blood pressure lowering

69

84

0.101

  Lipid lowering

31

43

0.310

  Glucose lowering

9

13

0.750

  Immunosuppressive

8

4

0.299

  Antibiotics

50

43

0.555

  Proton pump inhibitor

23

23

1.000

Active follow-up at the nephrological unit, %

21

23

0.816

Time since diagnostic kidney biopsy, years

10 (4–20)

11 (6–20)

0.150

Current kidney function, data available from 41 female and 41 male patients

  Estimated glomerular filtration rate (eGFR), ml/min/1.73m²

78 (54–93)

54 (36–68)

< 0.001

  eGFR < 60 ml/min/1.73m², %

29

59

0.014