Table 1 Basic characteristics of the OP and non-OP population (n = 6267)

Number

602

5665

–

Age (years)

59.0 ± 6.9

51.5 ± 7.1

<  0.001

 40–49 (%)

9.1

43.7

 50–59 (%)

42.0

41.3

 60–69 (%)

42.9

13.4

  ≥ 70 (%)

6.0

1.6

Gender (female, %)

86.2

37.4

<  0.001

Smoking (%)

8.8

26.6

<  0.001

Drinking (%)

18.3

42.8

<  0.001

BMI (kg/m²)

23.2 ± 3.0

24.6 ± 3.2

<  0.001

Obesity (BMI ≥ 28 kg/m², %)

6.6

14.0

<  0.001

Diabetes (%)

12.1

11.2

0.499

Hypertension (%)

38.2

31.3

0.001

Activity level (h/week)

2.7 ± 3.7

2.1 ± 3.3

0.007

Nutritional supplements (%)

47.3

34.4

<  0.001

Dietary calcium intake (mg/day)

443.4 ± 318.0

486.4 ± 325.0

<  0.001

Dietary fibre intake (g/day)

15.8 ± 12.4

18.0 ± 14.9

<  0.001

Dietary energy intake (Kcal/day)

1481.7 ± 776.0

1638.2 ± 750.7

<  0.001

Dietary selenium intake (μg/day)

39.1 ± 31.1

44.0 ± 23.3

<  0.001