Table 3 Correlation between different types of change measurement (indirect, quasi-indirect, direct; product–moment correlation coefficient r or intra-class correlation coeffiecient ICC); regression of transition ratings (standardized linear-regression coefficients); reliability (Cronbach’s alpha)
From: Agreement between pre-post measures of change and transition ratings as well as then-tests
IRES sleep function | SF-36 physical-functioning index | SCL-90-R somatisation# | |
|---|---|---|---|
Correlation between measures of change | |||
Indirect × direct change | r = .483*** | r = .381*** | r = .375*** |
Indirect × quasi-indirect change | r = .657*** | r = .713*** | r = .603*** |
Correlation between pre-test, post-test, retrospective pre-test and transition ratings | |||
Pre-test × retrospective pre-test | r = .682*** | r = .819*** | r = .767*** |
ICC = .671*** | ICC = .815*** | ICC = .761*** | |
Pre-test × post-test | r = .480*** | r = .677*** | r = .612*** |
Retrospective pre-test × post test | r = .521*** | r = .658*** | r = .738*** |
Transition ratings (direct) × pre test | r = −.149 | r = −.129 | r = −.112 |
Transition ratings (direct) × post test | r = .309*** | r = .166* | r = .229** |
Regression (dependent variable: transition ratings) | |||
Post test | β = .577*** | β = .508*** | β = .486*** |
Pre test | β = −.475*** | β = −.486*** | β = −.414*** |
Reliability (Cronbach’s α) | |||
Pre test | α = .821 | α = .919 | α = .770 |
Retrospective pre test | α = .896 | α = .938 | α = .815 |
Post test | α = .817 | α = .921 | α = .827 |
Transition ratings (direct) at post test | α = .897 | α = .959 | α = .873 |