| MEASUREMENT PROPERTIES | |
| Limitations | <5 European languages (English) |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
The principal component analysis revealed the greatest eigenvalue was less than 3 for both scales (2.4 and 2.5), supporting the unidimensionality of the scale, with 54.8% (48.1%) of the variance in the data explained by the model. Internal consistency of the IPEQ as a whole was low but acceptable with Cronbach’s alpha of 0.60 and 0.61. |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
Test–retest reliability was assessed by the ICC between scores obtained in the initial survey and at one week follow-up. The IPEQ had excellent test-retest reliability, intraclass correlation coefficient 0.87 |
| C. Reliability interobserver or Measurement error | Not Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
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| 2. VALIDITY | |
| A. Content validity: face validity | Not Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
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| B. Construct Validity: Structural validity |
Tested |
| Hypotheses-testing | Not Tested |
| Cross-cultural validity | Not Tested |
| Brief Description |
Planned physical activity scores were significantly lower in older participants, in people with worse health and a worse score on the timed up-and-go test. The two versions of the test were compared using non-parametric Spearman correlations. Overall, the correlation was substantial to outstanding, ranging from 0.67 to 0.89, with a similar concurrent validity |
| C. Criterion validity | Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
The coefficients with accelerometer at low and medium cut points were 0.29 and 0.33, respectively, and 0.26 and 0.35 for walking. The Bland-Altman plot showed increased errors with higher values of IPEQ. IPEQ incidental physical activity questions and IPEQ as a whole were significantly correlated with accelerometer light intensity (100-760 counts per minute, ρ = 0.29 and 0.23). |