Table 1 Clinical characteristics of female and male OPLL and serum concentration of leptin, insulin, and ALP

Non-OPLL (n = 14)

OPLL (n = 11)

p (Student’s t)

Age (year)

61.95 ± 10.93

57.25 ± 8.68

N.S.

Height (cm)

1.61 ± 0.05

1.62 ± 0.05

N.S.

Weight (kg)

62.79 ± 9.86

66.83 ± 10.55

N.S.

BMI (kg/m)

24.10 ± 3.37

25.49 ± 3.05

N.S.

Serum leptin (ng/ml)

22.30 ± 9.21

37.68 ± 25.22

< 0.05

Leptin/BMI

0.93 ± 0.33

1.50 ± 0.97

< 0.05

Serum insulin (μU/ml)

19.00 ± 8.60

22.90 ± 13.20

Serum ALP

7.17 ± 1.11

8.05 ± 0.73

Non-OPLL (n = 15)

OPLL (n = 24)

p (Student’s t)

Age (year)

57.4 ± 11.04

59.04 ± 9.32

N.S.

Height (cm)

170 ± 4.20

170 ± 7.07

N.S.

Weight (kg)

73.53 ± 13.68

76.61 ± 12.99

N.S.

BMI (kg/m)

25.26 ± 4.46

26.47 ± 3.46

N.S.

Serum leptin (ng/ml)

13.45 ± 6.32

16.69 ± 6.90

N.S.

leptin/BMI

0.52 ± 0.19

0.65 ± 0.25

N.S.

Serum insulin (μU/ml)

22.10 ± 11.00

29.20 ± 30.00

N.S.

Serum ALP

7.25 ± 1.57

7.97 ± 1.63