Table 2.

Descriptive statistics of the 15 items of the QPR-15-SP.

Item	Range	Mean	Standard deviation	Skewness	Kurtosis
Item 1	0–4	2.69	1.158	−0.787	−0.203
Item 2	0–4	2.81	1.025	−0.818	0.229
Item 3	0–4	2.87	1.089	−1.108	0.842
Item 4	0–4	2.31	1.270	−0.456	−0.840
Item 5	0–4	2.65	1.095	−0.493	−0.577
Item 6	0–4	2.83	1.038	−0.974	0.799
Item 7	0–4	3.03	1.092	−1.197	0.788
Item 8	0–4	2.98	1.106	−1.323	1.231
Item 9	0–4	2.91	1.089	−0.882	0.021
Item 10	0–4	2.9	1.093	−1.080	0.649
Item 11	0–4	2.69	1.107	−0.939	0.377
Item 12	0–4	2.62	1.126	−0.647	−0.375
Item 13	0–4	2.71	0.982	−0.706	0.271
Item 14	0–4	2.71	1.002	−0.690	0.129
Item 15	0–4	3.06	0.964	−1.179	1.191