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Abstract
Clustering refers to the co-occurrence of behaviour and may be particularly relevant
in light of the present obesity epidemic. Since evidence regarding clustering of motivational
and habitual constructs within the framework of the Theory of Planned Behaviour (TPB)
is limited, clustering effects of TPB cognitions and habit strength regarding soft
drink consumption and television viewing were studied in a sample of Dutch adolescents
(n = 312; mean age = 14.62; SD = 1.62) using cross-sectional data. Results showed
that not only soft drink consumption and television viewing cluster (r = .42), but
also their intentional (r = .36) and habitual (r = .37) constructs. Furthermore, unmediated
effects were found between habit strength and its respective behaviour, whereas habit
strength was associated with its clustered behaviour through decreased perceptions
of controllability. Our findings suggest that interventions that aim to change habitual
soft drink consumption and television viewing may need to incorporate an environmental
component, as well as explore the potential usefulness of synergistic effects of incorporating
multiple clustered behaviours, as well as their corresponding beliefs and habits in
health behaviour change interventions.