Feasibility, reliability and validity of health-related quality of life questionnaire among adult pulmonary tuberculosis patients in urban Uganda: cross-sectional study

Table 2 Reliability of the Medical Outcomes Survey involving 133 tuberculosis participants in Kampala, Uganda, 2007-2008

Subscale	Number of items	Cronbach's α	Correlation with VAS score^a
Perceived health	5	0.81	0.48
Bodily pain	2	0.88	0.46
QoL	1	-²	0.47
Role functioning	2	0.65	0.42
Social functioning¹	1	-²	0.49
Vitality	4	0.89	0.48
Mental health	5	0.90	0.47
Health distress	4	0.96	0.40
Cognitive function	4	0.88	0.35
Physical functioning	6	0.89	0.46
Health transition	1	-²	0.38

^aAll Medical Outcomes Survey subscales had a correlation p-value <0.001. ¹One individual missed social function response. ²Internal consistency reliability cannot be calculated for a single-item scale.

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