Critically evaluate the theory of planned behaviour in relation to understanding health behaviours

Question 1

Intro

Answer 1

• TPB
• -Ajzen, 1991
• -PBC, sheeran et al (2003)
• -diagram

Question 2

Paragraph 1

Answer 2

• effectiveness,
• -McEachan et al (2011)
• -Ajzen (1991)
• BI-I relationship
• -Sheeran (2002)
• -Webb and Sheeran

Question 3

Paragraph 2

Answer 3

-Armitage and Conner (2001)
e- Armitage and Conner (2001)
–McEachan et al (2011)

Question 4

Paragraph 3

Answer 4

• Cooke and French (2008)
• McEachan et al (2011)
• Hagger et al (2002)

Question 5

Paragraph 4

Answer 5

• Interventions
• -schmidt and Kabst (2016)
• -Tyson et al (2014)
• Hardeman et al (2002)
• Fishbein and Ajzen (2010)
• Hardeman

Question 6

Paragraph 5

Answer 6

• Additional predictors
• -McEachan et al (2011)
• The refractive Impulsive model of Strack and Deutsch (2004)
• Gardner (2014)

Question 7

Paragraph 6

Answer 7

• Self-efficacy
• -Ajzen (2002a)
• -Rogers et al (2008)
• -Armitage and Conner (2001)

Question 8

Conclusion

Answer 8

-TPB
-attitudes
Intentions

Question 9

Ajzen (1991)

Answer 9

Theory of Planned behaviour

Question 10

Sheeran et al (2003)

Answer 10

where PBC was accurate it provided stronger predictions of behaviour and moderated the intention-behaviour relationship (higher PBC was associated with stronger intention-behaviour relationships).

Question 11

McEachan et al (2011)

Paragraph 1

Answer 11

attitudes, subjective norms and perceived behavioural control explained 37% of variance in changes to behavioural intentions, while behavioural intentions and perceived behavioural control explained only 19% of variance in behaviour change.

Question 12

Ajzen (1991)

study

Answer 12

conducted a meta-analysis of 16 studies and found the multiple correlation between intentions and attitude, subjective norm and PBC to be 0.71 indicating high relatedness between intentions and the three constructs

Question 13

Sheeran (2002)

Answer 13

a meta-analysis of meta-analyses of prospective test of the intention-behaviour relationship. Across 422 studies, intentions explained 28% of the variance for behaviour, this is a large effect size

Question 14

Webb and Sheeran (2006)

Answer 14

meta-analysis of 47 studies to address this and found that a medium-large size change in intentions lead to a small-medium change in behaviour

Question 15

Armitage and Conner (2001)

paragraph 2

Answer 15

• TPB accounts for 27% and 39% of the variance in behaviour and intention.
• The average multiple correlation of attitude, subjective norm and PBC with intention was R=.63, accounting for 39% of the variance.
• Independently reported correlation between Perceived Behavioural Control and intention strong (r =.43), and PBC independently accounted for 6% of the variance PBC also added an average of 2% to the prediction of behaviour

Question 16

e-Armitage and Conner (2001)

Answer 16

reported there were differences in proportions of variance in measures of both objective (20%) and self-reported (31%) behaviour

Question 17

McEachan et al (2011)

paragraph 2

Answer 17

when using self-reported measures, the relationships with behaviour are stronger

Question 18

Cooke and French (2008)

Answer 18

a meta-analysis of 33 applications of TPB to screening attendance including all the constructs of TPB and found attitudes were the strongest predictor of intentional (with subjective norms being the least predictive) while behavioural intentions were the strongest predictor of behavioural

Question 19

McEachan et al (2011)

paragraph 3

Answer 19

the main predictor for behavioural intention was Attitudes towards the behaviour (while the lowest predictor was subjective norms) and the main predictor for Behaviour was behavioural intention

Question 20

Hagger et al (2002)

Answer 20

meta-analysis on 70 applications of TPB to physical activity and found that a clear majority were successful

Question 21

Schmidt and Kabst (2016)

Answer 21

reported behaviour change interventions based on TPB generate medium sized effects

Question 22

Tyson et al (2014)

Answer 22

after conducting a meta-analysis on 34 studies on increasing heterosexual condom use there was small sig effect (d=0.126)

Question 23

Hardeman et al (2002)

Answer 23

meta-analysis of 24 intervention studies and found that many interventions are poorly designed,

Question 24

Fishbein and Ajzen (2010)

Answer 24

out of all the studies that Hardeman looked at, only 4 conformed to the requirements of TPB

Question 25

McEachan et al (2011)

paragraph 5

Answer 25

86 studies of past behaviour found an additional 5.3% of variance was explained for Intentions and 10.9% explained for behaviour.

Question 26

The Refractive Impulsive Model of Strack and Deutsch (2004)

Answer 26

strong impact of past behaviour on future behaviour may be explained by past behaviour becoming more important as behaviour becomes more habitual with frequent performance

Question 27

Gardner (2014)

Answer 27

18/24 studies provided evidence that intentions weaker predicted behaviour as habit strength increased

Question 28

Ajzen (2002a).

Answer 28

Self-efficacy has been argued to be similar to the construct of perceived behavioural control

Question 29

Rodgers et al (2008)

Answer 29

there was greater predictive power for self-efficacy measures

Question 30

Armitage and Conner (2001)

Answer 30

self-efficacy explained more variance for intentions than controllability (19% vs 5%). Behaviour was also better explained (12% vs 3%)
self-efficacy was not a better predictor than a unidimensional measure of perceived behavioural control for intentions (19% vs 19%) or behaviour (12% vs 16%)