Model | Process (explanatory) variables | N items | Alpha | Mean (SD) | Behavioural intention | Behavioural simulation | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
r* | B | Beta | Model summary R2(adj) | r* | B | Beta | Model summary R2(adj) | |||||
TPB | Attitude direct | 3 | 0.55 | 16.9 (2.9) | 0.456**** | 0.301**** | 0.267 | 0.23**** | ||||
Attitude Indirect | 8 | - | 205.6 (36.1) | 0.364**** | 0.017**** | 0.195 | 0.08ns | |||||
Subjective Norm | 5 | - | 97.2 (36.7) | 0.226**** | 0.014*** | 0.157 | 0.07ns | |||||
PBC direct | 3 | 0.64 | 11.9 (3.5) | 0.082ns | -0.018ns | -0.020 | 0.108** | 0.026ns | 0.055 | |||
PBC indirect | 6 | 0.79 | 26.3 (5.6) | 0.388**** | 0.153**** | 0.266 | 0.33 | 0.319**** | 0.076**** | 0.258 | ||
Behavioural intention | 4 | 0.83 | 0.01 (3.2) | 0.307**** | 0.108**** | 0.210 | 0.14 | |||||
SCT | Risk Perception (same as anticipated consequences) | 3 | 0.61* | 16.6 (2.8) | 0.441**** | 0.344**** | 0.298 | 0.191**** | 0.029** | 0.144 | ||
Outcome Expectancies (same as attitude indirect) | 8 | - | 205.6 (36.1) | 0.364**** | 0.017**** | 0.190 | 0.105** | -0.034ns | -0.087 | |||
Self Efficacy | 6 | 0.88 | 29.2 (5.4) | 0.411**** | 0.178**** | 0.294 | 0.32 | 0.391**** | 0.122**** | 0.391 | 0.17 | |
OLT | Anticipated consequences | 3 | 0.61 | 16.6 (2.8) | 0.441**** | 0.257**** | 0.224 | 0.197**** | 0.026ns | 0.102 | ||
Evidence of habit | 2 | 0.61 | 11.4 (2.1) | 0.746**** | 1.048**** | 0.671 | 0.60 | 0.294**** | 0.202**** | 0.251 | 0.10 | |
Post-intentional variables | ||||||||||||
II | Prior planning | 1 | - | 5.8 (1.0) | 0.343**** | 0.545**** | 0.332 | 0.12 | ||||
Action planning | 3 | 0.92 | 16.5 (3.0) | 0.216**** | 0.114**** | 0.206 | 0.05 | |||||
Cross-theory analysis (variables retained in regression models) | ||||||||||||
TPB | Attitude direct | 0.102** | 0.101 | |||||||||
Subjective Norm | 0.010*** | 0.117 | ||||||||||
SCT/OLT | Risk Perception/Anticipated consequences | 0.194**** | 0.168 | |||||||||
OLT | Evidence of habit | 0.948**** | 0.605 | |||||||||
SCT | Self-efficacy | 0.061** | 0.090 | 0.63 | 0.393**** | 0.091**** | 0.294 | |||||
II | Prior planning | 0.343**** | 0.326**** | 0.198 | 0.18 |