Skip to main content

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