|Model||Author||Meta-analyses examining the model||Evidence supporting theory|
|Biomedical||None identified (NI)|
|HBM||Rosenstock et al. 1966||
1. 46 studies- substantial empirical support.|
2. 16 studies; at best 10% of variance accounted for by any one dimension of the theory.
|SCT||Bandura 1950's||38||27 studies; self-efficacy explained between 4% and 26% of variance|
|TRA||Fishbein & Ajzen, 1975||41||Theory explains about 25% of variance in behaviour from intention alone, and explains slightly less than 50% of variance in intentions.|
|TPB||Fishbein & Ajzen, 1975||
1. 13 studies; 75% of interventions effected a change in behaviour in desired direction.|
2. 56 studies; About a third of the variations in behaviour can be explained by the combined effect of intention and perceived behavioural control in the domain of health.
3. 185 independent empirical tests: combined effect of intention and perceived behavioural control explained about a third of variation in behaviour. Theory can explain 20% of prospective measures of actual behaviour.
|PMT||Rogers, 1975||35||65 studies – Moderate effects in predicting behaviour.|
|Self-regulation||Leventhal et al. 1980||NI|
|IMB||Fisher and Fisher 1992||NI|
|TTM||Prochaska & DiClemente 1983||
1. Stage based interventions not more effective at increasing smoking cessation than non-stage based interventions.|
2. 91 independent samples. Results support that individuals use all 10 processes of change.