Comparison of alternative versions of the job demand-control scales in 17 European cohort studies: the IPD-Work consortium

Table 3 Correlation between the complete psychological job demands scale vs. shorter versions of the scale

Job Demands*	Belstress n = 21093	Gazel n = 11365	HeSSup n = 16784	SLOSH n = 10975	WOLF N n = 4704	WOLF S n = 5670
	r(95% CI)^†	r(95% CI)	r(95% CI)	r(95% CI)	r(95% CI)	r(95% CI)
Complete scale vs. B (4 items)	0.968 (0.967-0.969)	0.951 (0.949-0.953)	0.975 (0.974-0.976)	0.972 (0.970-0.973)	0.969 (0.967-0.971)	0.972 (0.970-0.973)
Complete scale vs. C (4 items)	0.956 (0.954-0.957)	0.943 (0.941-0.945)	0.957 (0.955-0.958)	0.962 (0.960-0.963)	0.954 (0.951-0.956)	0.961 (0.959-0.963)
Complete scale vs. D (3 items)	0.928 (0.927-0.930)	0.903 (0.900-0.907)	0.932 (0.930-0.934)	0.933 (0.931-0.935)	0.927 (0.923-0.931)	0.933 (0.929-0.936)
Complete scale vs. E (3 items)	0.928 (0.926-0.930)	0.902 (0.899-0.906)	0.924 (0.921-0.926)	0.914 (0.911-0.917)	0.914 (0.909-0.919)	0.912 (0.907-0.916)
Complete scale vs. F (2 items)	0.876 (0.872-0.879)	0.854 (0.848-0.858)	0.836 (0.831-0.840)	0.855 (0.850-0.860)	0.837 (0.828-0.845)	0.844 (0.836-0.851)
Complete scale vs. G (2 items)	0.782 (0.776-0.787)	0.759 (0.751-0.767)	0.820 (0.815-0.825)	0.805 (0.799-0.812)	0.808 (0.798-0.818)	0.817 (0.808-0.825)

*Abbreviated items of the complete scale: 1. "Work very fast"; 2. "Work very hard/intensively"; 3. " No excessive work/Too much effort "; 4. "Enough time"; 5. "Conflicting demands".
Version B include items 1, 2, 4, 5; version C items 1, 2, 3, 4; version D items 2, 3, 4; version E items 1, 4, 5; version F items 1, 4; and version G items 4, 5.
^†Pearson product-moment correlation coefficient (r) and 95% confidence interval (95% CI).

ISSN: 1471-2458