Monitoring the functional health status of stroke patients: the value of the Stroke-Adapted Sickness Impact Profile-30

Abstract

Purpose: To further validate the Stroke-Adapted Sickness Impact Profile-30 (SA-SIP30) and to determine its responsiveness in a stroke rehabilitation population.

Method: Data of 122 communicative stroke patients (mean age 57 years), selected for an inpatient rehabilitation programme, were available. All had suffered different types of stroke. Six months and one year post-stroke, the patients completed the SIP68 plus nine stroke-specific questions from the SIP136, enabling us to derive the SA-SIP30 from the questionnaire. We determined internal consistency, construct and clinical validity and responsiveness of the SA-SIP30. Total, physical and psychosocial dimension scores were calculated.

Results: Internal consistency was moderate to good (alpha>0.68) and correlation between the SIP68 and the SA-SIP30 was high (r>0.85), indicating good construct validity for total score and both dimension scores. Clinical validity assessment showed that total and psychosocial dimensions scores were significantly higher for patients with a cortical infarction compared to respectively subarachnoid haemorrhage and subcortical infarction (p<0.05). Effect sizes for the SA-SIP30 were moderate (between 0.56 and 0.65).

Conclusions: The SA-SIP30 proved valid and responsive in our stroke rehabilitation population. The major advantages of the SA-SIP30 are the lesser number of items and, therefore, the shorter completion time and the fact that it is a stroke-specific scale to determine health-related functional status.