Table 2 Comparison of clinical variables, bone and body composition densitometric data in patients with AS and a healthy control group

Age (yrs): m (SD)

40.7

(11.0)

40.9

(11.0)

NS

Height (m): m (SD)

1.72

(0.08)

1.74

(0.08)

NS

Weight (kg): m (SD)

72.4

(13.2)

77.0

(12.0)

NS

BMI (kg/m²): m (SD)

25.3

(4.0)

24.1

(3.4)

NS

Fat-free mass (kg): m (SD)

49.2

(6.3)

52.0

(6.3)

0.014

Fat-free mass index (kg/m²): m (SD)

16.3

(2.0)

17.2

(1.9)

0.007

Fat mass (kg): m (SD)

21.2

(10.5)

22.8

(9.7)

NS

Fat mass index (kg/m²): m (SD)

6.9

(3.1)

7.5

(3.7)

NS

Appendicular mass (kg): m (SD)

22.2

(3.0)

23.4

(3.3)

0.033

Appendicular mass index (kg/m²): m (SD)

7.4

(0.8)

7.7

(0.9)

NS

Lumbar spine BMD (g/cm²): m (SD)

1.19

(0.1)

1.12

(0.1)

0.023

Lumbar spine T-score: m (SD)

−0.64

(2.5)

−0.10

(2.5)

0.019

Total hip BMD (g/cm²): m (SD)

0.97

(0.1)

1.08

(0.1)

<0.0001

Total hip T-score: m (SD)

−0.56

(1.3)

0.42

(1.1)

<0.0001

Osteoporosis any site: n (%)

13

(19.4 %)

2

(3.0)

0.002

Pre-sarcopenia: n (%)

33

(49.3)

19

(28.4)

<0.01