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Table 1 Results obtained by observers and differences between measurements

From: Inter-rater reliability of clinical mobility measures in ankylosing spondylitis

Measurement

Observer 1

Observer 2

Difference

C.V.

S.D.D.

Chest expansion a (cm)

3.45 (1.73)

[1.50–11.00]

3.61 (2.27)

[1.00–11.50]

−0.15 (1.67)

[−8.50/2.00]

47.31 %

3.27

Modified Schöber a b(cm)

2.79 (1.59)

[0.00–6.00]

2.99 (1.90)

[0.00–7.00]

−0.21 (1.22)

[−3.50/3.20]

42.81 %

2.39

Occiput-wall a (cm)

7.52 (6.56)

[0.00–19.00]

6.71 (6.12)

[0.00–17.00]

0.80 (1.63)

[−2.00/6.00]

22.91 %

3.19

Tragus-wall b (cm)

17.97 (5.96)

[10.50–28.00]

17.31 (5.53)

[11.00–26.00]

0.64 (1.56)

[−2.00/5.00]

8.84 %

3.06

Floor to finger distance (cm)

26.05 (11.43)

[5.00–50.00]

26.15 (11.75)

[3.50–48.00]

−0.09 (3.57)

[−12.00/8.00]

13.68 %

6.99

Lateral lumbar flexion a,b (cm)

8.30 (5.89)

[1.00–26.50]

8.20 (5.16)

[1.00–19.50]

0.09 (3.19)

[−9.00/10.50]

38.67 %

6.25

Intermalleolar distanceb (cm)

92.67 (17.75)

[50.00–117.00]

90.89 (17.39)

[50.00–118.00]

0.97 (4.37)

[−9.00/12.00]

4.76 %

8.56

BASMI10

4.81 (2.11)

[0.94–8.74]

4.67 (2.29)

[0.96–8.78]

0.14 (0.65)

[−1.41/1.66]

13.71 %

1.27

BASMI2 a

4.17 (2.71)

[0.00–8.75]

3.97 (2.69)

[0.00–8.75]

0.20 (1.24)

[−2.50/3.50]

30.47 %

2.43

  1. Results of observers and difference are expressed as mean (SD) [Min-Max]
  2. CV coefficient of variation: SD of difference divided by mean value in %, SDD smallest detectable difference according Bland-Altman criteria
  3. a Included in ASAS core set. b Included in BASMI