Workplace Sitting Breaks Questionnaire (SITBRQ): an assessment of concurrent validity and test-retest reliability

BMC Public Health

Table 3 Test-retest reliability ^* of the Workplace Sitting Breaks Questionnaire (SITBRQ)

Questionnaire item	Spearman’s rho (95% CI)^†	Cohen’s kappa (95% CI)^‡	% correctly classified (95% CI)^§	% in same or adjacent category (95% CI)^\|\|	% highly misclassified (95% CI)^¶
Frequency of breaks (breaks/hour)	0.71 (0.59 - 0.79)	0.74 (0.64 - 0.84)	51.0 (41.0 - 61.0)	85.4 (78.4 - 92.5)	14.6 (7.5 - 21.6)
Total duration of breaks (minutes/day)	0.59 (0.45 - 0.71)	0.61 (0.38 - 0.85)	46.9 (36.9 - 56.9)	79.2 (71.0 - 87.3)	20.8 (12.7 - 29)

^*Test and retest surveys were conducted a maximum of 14 days apart.
^†Spearman’s rank correlation between test and retest and its 95% confidence interval.
^‡Quadratic weighted Cohen’s kappa coefficient of agreement between test and retest and its 95% confidence interval.
^§Percent of participants classified in same categories in test and retest its 95% confidence interval.
^||Percent of participants classified in same or adjacent categories in test and retest its 95% confidence interval.
^¶Percent of participants classified in distant categories in test and retest (two or more categories apart) its 95% confidence interval.

ISSN: 1471-2458