Daily physical activity in ankylosing spondylitis: validity and reliability of the IPAQ and SQUASH and the relation with clinical assessments

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 score^a	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).

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