An initial application of computerized adaptive testing (CAT) for measuring disability in patients with low back pain

Table 3 Convergent validity between θ_R-CAT and subscale and total scores of the four original questionnaires.

Total/section scores	θ_R-CAT Body Functions	θ_R-CAT Activity-Participation
WHODAS II – Understanding and communicating	0.587**	0.396**
WHODAS II – Getting around	0.437**	0.801**
WHODAS II – Self care	0.391**	0.642**
WHODAS II – Getting along with people	0.382**	0.321**
WHODAS II – Getting along with people (without sexual activities item)	0.260*	0.071
WHODAS II – Life activities (without work items)	0.423**	0.647**
WHODAS II – Participation in society	0.549**	0.697**
WHODAS II – Total (without work and sexual items)	0.667 **	0.820**
ODI	0.531**	0.724**
RDQ	0.639**	0.748**
NHP Energy	0.595**	0.424*
NHP Pain	0.659**	0.547**
NHP Emotional	0.892**	0.422**
NHP Sleep	0.737**	0.424**
NHP Social Isolation	0.809**	0.422**
NHP Physical Mobility	0.510**	0.708**

*: ≤ 0.01, **: ≤ 0.001
WHODAS II: World Health Organization Disability Assessment Schedule II, ODI: Oswestry Disability Index, RDQ: Roland Morris Low Back Pain Disability Questionnaire, NHP: Nottingham Health Profile.
Expressed as Spearman's correlation (n = 91).

ISSN: 1471-2474