Table 1 Characteristics of the study sample stratified by quartiles of peak oxygen uptake (VO2peak) values (n = 3,558).

From: Lower cardiorespiratory fitness is associated with an altered gut microbiome. The Study of Health in Pomerania (SHIP)

Parameter

First quartile

Second quartile

Third quartile

Fourth quartile

Total

p-value*

N (%)

890

889

889

890

3,558

–

VO2peak (L/min)

0.58 to 1.48

1.49 to 1.84

1.85 to 2.34

2.35 to 4.68

0.80 to 4.68

–

Age (years)

63 (53–70)

56 (45–65)

54 (43–64)

46 (38–55)

55 (44–65)

< 0.001

Female sex (%)

84.8

71.5

38.1

5.2

49.9

< 0.001

Body mass index (kg/m2)

26.7 (23.6–30.2)

27.3 (24.3–30.6)

27.8 (25.1–30.9)

27.8 (25.4–30.8)

27.4 (24.7–30.6)

< 0.001

HbA1c (%)

5.3 (5.0–5.8)

5.3 (4.9–5.7)

5.3 (4.9–5.7)

5.2 (4.9–5.6)

5.3 (4.9–5.7)

< 0.001

Metformin usage (%)

6.3

4.7

4.3

2.8

4.5

0.005

Smoking (%)

16.9

22.5

22.4

20.9

20.7

0.010

Diet (food frequency score)

15.0 (13.0–17.0)

15.0 (13.0–17.0)

14.0 (12.0–16.0)

13.0 (11.0–15.0)

14.0 (12.0–17.0)

< 0.001

  1. VO2peak is given as the range within each quartile (min–max). Age, body mass index, glycated haemoglobin (HbA1c, %), food frequency score (FFS), and VO2peak are given as median (1st−3rd quartile). Female sex, metformin usage, and smoking are stated as percentages. *p-values are based on the chi-squared test for categorical variables and the Kruskal–Wallis test for continuous variables. Post-hoc analyses can be found in Supplemental Table 1. N Number of cases. Significant values are in bold.
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