Translation and validation of the Dutch Spine Oncology Study Group Outcomes Questionnaire (SOSGOQ2.0) to evaluate health-related quality of life in patients with symptomatic spinal metastases

Table 2 Internal consistency and item-domain correlations of the Dutch SOSGOQ2.0 domains

			Physical function	Pain	Mental health	Social function	Social function (without item 20)
Internal consistency, α^a			0.87	0.86	0.72	0.04	0.68
Item-domain correlations, r_s	N	Item – Own domain	Item – Other domains
Physical function
1 Level of activity	147	0.80^*	-	0.44^*	0.25^*	0.29^*	0.38^*
2 Ability to work	145	0.85^*	-	0.44^*	0.38^*	0.25^*	0.39^*
3 Limited ability to care for yourself	147	0.70^*	-	0.50^*	0.26^*	0.39^*	0.49^*
4 Assistance to travel outside	147	0.82^*	-	0.44^*	0.26^*	0.37^*	0.44^*
5 Assistance walking	146	0.80^*	-	0.43^*	0.23^**	0.33^*	0.42^*
6 Social functions	147	0.69^*	-	0.44^*	0.25^*	0.22^**	0.39^*
Pain
11 Back/neck pain	147	0.83^*	0.43^*	-	0.42^*	0.47^*	0.59^*
12 Pain in most comfortable position	147	0.82^*	0.42^*	-	0.40^*	0.53^*	0.65^*
13 Limiting mobility	147	0.84^*	0.53^*	-	0.49^*	0.45^*	0.62^*
14 Ability to manage pain	146	0.80^*	0.49^*	-	0.43^*	0.31^*	0.47^*
15 Overwhelming pain	147	0.79^*	0.45^*	-	0.38^*	0.32^*	0.44^*
Mental health
16 Depression	147	0.87^*	0.31^*	0.39^*	-	0.19^**	0.40^*
17 Anxiety	146	0.89^*	0.33^*	0.52^*	-	0.32^*	0.49^*
Social function
18 Concentration	146	0.74^*	0.50^*	0.66^*	0.50^*	⁻	0.87^*b
19 Personal relationships	145	0.76^*	0.41^*	0.52^*	0.38^*	-	0.87^*b
20 Meeting new people	145	0.16	-0.32^*	-0.37^*	-0.46^*	-	-
Neurological function items
7 Neurol. function – legs	147	-	0.44^*	0.35^*	0.15	0.20^**	0.20^**
8 Neurol. function – arms	147	-	0.39^*	0.38^*	0.20^**	0.29^*	0.29^*
9 Neurol. function – bowel	147	-	0.16	0.11	0.02	-0.02	0.00
10 Neurol. function – bladder	146	-	0.13	0.04	0.09	0.05	0.07

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