Assessing physical workload among people with musculoskeletal disorders: validity and reliability of the physical workload questionnaire

Table 4 Test-retest reliability

	First test	Re-test	Difference	ICC_2.1 (95% CI)	SEM_agreement	SDC_95% ind
Heavy physical work (n = 48)	27.3 (24.7)	22.2 (21.9)	−5.1 (8.5)*	0.96 (0.88, 0.98)	6.9	19.2
Long-lasting postures and repetitive movements (n = 48)	49.2 (25.4)	42.7 (24.1)	−6.5 (12.6)*	0.92 (0.81, 0.96)	10.0	27.7

ICC Intraclass correlation coefficient, SEM Standard error of measurement, SDC Smallest detectable change
Score values and difference values are presented with mean (SD)
*P values < 0.01

ISSN: 1471-2474