Table 1 Comparison of variables between the O blood group and the non-O blood group

1

Age (years)

47.3 (5.5)

46.0 (43.0–51.0)

47.2 (4.7)

47.0 (44.0–52.0)

0.76

2

Duration of stay at Anuradhapura (years)

28.5 (14.5)

25.0 (16.0–43.0)

29.2 (14.2)

30.0 (18.0–43.0)

0.91

3

Hours of sleep per day

6.2 (0.9)

6.0 (6.0–7.0)

6.8 (1.2)

7.0 (6.0–8.0)

0.03

4

Demi-span (cm)

87.9 (5.1)

88.0 (84.0–92.0)

86.0 (4.9)

86.0 (82.0–89.0)

0.07

5

Weight (kg)

68.6 (9.9)

68.6 (61.8–74.9)

67.4 (10.3)

67.1 (60.5–74.7)

0.55

6

Height (cm)

163.5 (8.3)

163.1 (158.1–171.0)

162.2 (7.9)

163.0 (155.4-167.2)

0.44

7

Body Mass Index (kgm^-2)

25.6 (2.8)

25.5 (23.8–27.7)

25.6 (3.6)

25.4 (23.5–27.9)

0.87

8

Waist circumference (cm)

87.6 (6.6)

87.0 (83.0-92.5)

87.7 (8.2)

88.0 (81.0–93.0)

0.98

9

Hip circumference (cm)

102.7 (6.0)

103.0 (99.0-105.0)

102.0 (6.4)

102.0 (99.0-105.0)

0.61

10

Waist/Hip ratio

0.2 (0.0)

0.2 (0.2–0.3)

0.3 (0.0)

0.3 (0.2–0.3)

0.92

11

Heart rate (per minute)

67.6 (4.5)

68.0 (64.0–72.0)

67.2 (5.3)

64.0 (64.0–72.0)

0.43

12

Systolic blood pressure (mmHg)

114.9 (11.5)

120.0 (110.0-125.0)

117.7 (8.6)

120.0 (110.0-125.0)

0.35

13

Diastolic blood pressure (mmHg)

75.5 (9.5)

70.0 (70.0–85.0)

75.7 (8.6)

70.0 (70.0–80.0)

0.97

14

Pulse pressure (mmHg)

39.4 (5.1)

40.0 (40.0–40.0)

42.0 (4.3)

40.0 (40.0–40.0)

0.02

15

Mean arterial blood pressure (mmHg)

88.6 (9.9)

86.7 (83.3–98.3)

89.7 (8.4)

86.7 (83.3–96.7)

0.56

16

Depression score (Depression Anxiety Stress Scale-21)

3.7 (3.3)

3.0 (1.0–5.0)

3.3 (3.6)

3.0 (1.0–5.0)

0.41

17

Anxiety score (Depression Anxiety Stress Scale-21)

3.3 (3.9)

2.0 (1.0–5.0)

3.4 (3.8)

2.0 (1.0–5.0)

0.72

18

Stress score (Depression Anxiety Stress Scale-21)

5.9 (3.8)

6.0 (3.0-7.5)

5.8 (4.3)

5.0 (3.0–8.0)

0.76

19

HbA1C (%)

5.4 (1.3)

5.2 (5.0-5.4)

5.5 (0.9)

5.4 (5.0-5.6)

0.18

20

Total cholesterol (mg/dl)

209.1 (36.0)

206.0 (187.5-228.5)

211.7 (34.0)

207.0 (188.0-238.0)

0.78

21

Serum creatinine (mg/dl)

0.8 (0.2)

0.8 (0.6-1.0)

0.8 (0.2)

0.8 (0.7-1.0)

0.48

22

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

101.3 (13.5)

107.0 (92.5–111.0)

99.3 (12.9)

102.0 (91.0-110.0)

0.36