Article

Objective: To evaluate reliability, internal consistency and construct validity
of the Posture and Postural Ability Scale for adults with cerebral palsy. Design:
Psychometric evaluation of a clinical assessment tool. Setting: Rehabilitation
centres in Sweden and Iceland. Subjects: Thirty adults with cerebral palsy aged
19-22 years, six people at each level I-V of the Gross Motor Function
Classification System. Main measures: The Posture and Postural Ability Scale
contains a 7-point ordinal scale for postural ability in supine, prone, sitting
and standing, and items for assessment of posture. Posture and postural ability
was rated from photos and videos by three independent assessors. Interrater
reliability was calculated using weighted kappa. Internal consistency was
analysed with Cronbach's alpha if item deleted and corrected item-total
correlation. Construct validity was evaluated based on known groups, using
Jonckheere Terpstra for averaged values of the three raters relative to the Gross
Motor Function Classification System. Results: There was an excellent interrater
reliability (kappa = 0.85-0.99) and a high internal consistency (alpha =
0.96-0.97, item-total correlation = 0.60-0.91). Median values differed (P < 0.02)
between known groups represented by the levels of gross motor function, showing
construct validity for all items. Conclusion: The Posture and Postural Ability
Scale showed an excellent interrater reliability for experienced raters, a high
internal consistency and construct validity. It can detect postural asymmetries
in adults with cerebral palsy at all levels of gross motor function.

Langue : ANGLAIS