Table 1 Demographic characteristics of the recruited subjects

Training set

Sample size

35

35

35

–

–

Medication (Y/N)

N

N

N

–

–

Sex (M/F)

14/21

17/18

18/17

χ² = 1.00

0.61

Age (years)^b

32.49 ± 14.12

36.40 ± 10.65

36.54 ± 5.98

F = 1.60

0.21

BMI^b

22.60 ± 1.95

22.09 ± 2.12

22.21 ± 1.72

F = 0.67

0.52

Test set

Sample size

20

20

20

–

–

Medication (Y/N)

6/14

N

N

–

–

Sex (M/F)

9/11

11/9

10/10

χ² = 0.40

0.82

Age (years)^b

28.45 ± 2.09

27.55 ± 2.05

30.15 ± 1.65

F = 0.47

0.63

BMI^b

21.86 ± 0.50

21.70 ± 0.55

21.74 ± 0.48

F = 0.03

0.98