Table 6. Correlation analyses, PSI and Cronbach’s α.

Sub-scale 1	Inter-Item Correlation *									PSI	Cronbach‘s α
										0.861	0.868
Item	Item_1a	Item_1b	Item_1c	Item_1d	Item_1e	Item_1f	Item_1g	Item_1h	Item_1i	Total-Item Correlation	Cronbach’s α if item deleted
Item_1a	1.000	0.559	0.486	0.306	0.309	0.305	0.368	0.356	0.291	0.515	0.861
Item_1b	0.559	1.000	0.430	0.232	0.338	0.307	0.314	0.302	0.262	0.467	0.865
Item_1c	0.486	0.430	1.000	0.450	0.482	0.415	0.354	0.325	0.419	0.589	0.855
Item_1d	0.306	0.232	0.450	1.000	0.615	0.551	0.452	0.400	0.388	0.613	0.852
Item_1e	0.309	0.338	0.482	0.615	1.000	0.597	0.468	0.457	0.539	0.695	0.844
Item_1f	0.305	0.307	0.415	0.551	0.597	1.000	0.580	0.485	0.483	0.680	0.846
Item_1g	0.368	0.314	0.354	0.452	0.468	0.580	1.000	0.535	0.435	0.633	0.850
Item_1h	0.356	0.302	0.325	0.400	0.457	0.485	0.535	1.000	0.519	0.606	0.854
Item_1i	0.291	0.262	0.419	0.388	0.539	0.483	0.435	0.519	1.000	0.603	0.853

Abbreviations

* = inter-item correlations > 0.7 showing redundancy are bold; α = Alpha; PSI = person separation index