Table 2

Physical activity of ankylosing spondylitis patients (with complete data) included in the reliability study

First assessment

Second assessment

ICC

95% confidence interval


IPAQ (MET-minutes/week) (n = 32)

Total activity score

3,849 (1,470 to 8,132)

4,349 (2,120 to 7,508)

0.83*

0.68 to 0.91

Work activity score

0 (0 to 3,710)

50 (0 to 3,197)

0.80*

0.63 to 0.90

Transport activity score

653 (284 to 1,607)

737 (209 to 1,589)

0.88*

0.77 to 0.94

Household and garden activity score

580 (53 to 1,481)

245 (90 to 1,406)

0.60*

0.33 to 0.79

Leisure time activity score

657 (195 to 1,718)

678 (111 to 1,832)

0.73*

0.52 to 0.86

SQUASH (n = 33)

Total activity scorea

5,760 (3,360 to 6,890)

5,600 (3,715 to 7,540)

0.89*

0.79 to 0.95

Work and school activity score

1,080 (0 to 4,440)

600 (0 to 4,680)

0.88*

0.77 to 0.94

Commuting activity score

0 (0 to 341)

0 (0 to 438)

0.48*

0.17 to 0.70

Household activity score

900 (420 to 1,815)

840 (240 to 1,635)

0.77*

0.59 to 0.88

Leisure-time and sports activity score

1,350 (775 to 1,795)

1,410 (480 to 2,635)

0.87*

0.76 to 0.93


Data are presented as median (interquartile range). No significant differences were found between the first and second assessments of the physical activity questionnaires. ICC, intraclass correlation; IPAQ, International Physical Activity Questionnaire; MET, metabolic equivalent; SQUASH, Short QUestionnaire to Assess Health-enhancing physical activity. aSQUASH total activity score was normally distributed with mean 5,617 (standard deviation ± 3,233) and 5,808 (standard deviation ± 3,825) at the first and second assessment, respectively. *Statistically significant intraclass correlation (P < 0.001).

Arends et al. Arthritis Research & Therapy 2013 15:R99   doi:10.1186/ar4279

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