Table 2. Items’ internal psychometric characteristics of STSS.

Items	rep.	rel.	internal validity
			H	B
stss 01	.974	.333	.583	.593
stss 02	.976	.479	.644	.647
stss 03	.979	.312	.532	.541
stss 04	.981	.504	.699	.695
stss 05	.982	.566	.744	.736
stss 06	.983	.608	.758	.753
stss 07	.985	.447	.676	.673
stss 08	.986	.540	.745	.738
stss 09	.978	.437	.622	.622
stss 10	.980	.370	.596	.597
stss 11	.982	.584	.761	.755
stss 12	.979	.479	.661	.662
stss 13	.982	.375	.602	.607
stss 14	.973	.423	.610	.614
stss 15	.981	.482	.669	.665
stss 16	.980	.424	.656	.654
stss 17	.973	.317	.549	.560

rep.–item sampling adequacy; rel.–item reliability; H–first principal component loading; B–item-total correlation.