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Table 2 Frequency of osteoporosis at baseline and at the 5-year follow-up

From: Which measuring site in ankylosing spondylitis is best to detect bone loss and what predicts the decline: results from a 5-year prospective study

Measuring site

Group

Patients with osteoporosis/BMD below expected range for age

p value

Baseline

5-year follow-up

Any measuring site

Total

39 (23)

45 (27)

0.24

Men

12 (13)**

16 (17)**

0.29

Women

27 (36)

29 (38)

0.75

Femoral neck

Total

10 (6)

12 (7)

0.72

Men

6 (7)

7 (8)

1.00

Women

4 (5)

5 (7)

1.00

Total hip

Total

1 (1)

1 (1)

1.00

Men

1 (1)

1 (1)

1.00

Women

0 (0)

0 (0)

Spine AP

Total

16 (10)

12 (7)

0.39

Men

4 (4)*

2 (2)**

0.69

Women

12 (16)

10 (13)

0.69

Spine lateral

Total

NA

NA

NA

Men

NA

NA

NA

Women

20 (26)

18 (24)

0.63

Total radius

Total

13 (8)

20 (12)

0.04

Men

7 (8)

11 (12)

0.13

Women

6 (8)

9 (12)

0.38

  1. Values are numbers (%)
  2. *p < 0.05, **p < 0.01, versus women
  3. Significant p values are shown in bold typeface
  4. AP anterior-posterior, BMD bone mineral density, NA not available