de Vries 2008.
Methods | Setting: community, Netherlands Recruitment: telephone recruitment for a multiple risk factor health promotion intervention | |
Participants | 156 smokers amongst 2827 participants, of whom 1331 (47%) responded at T4 Baseline all participants: 55% female, average age 49 |
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Interventions | ∙ Printed tailored letters on smoking as an identified risk factor (other targets were physical activity, nutrition); half of the group had action planning component in third letter ∙ Printed generic letters | |
Outcomes | Abstinence at 9 months (not defined) Validation: none | |
Notes | Effect of tailoring Numbers of smokers at baseline and numbers of quitters provided by study author |
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Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Random sequence generation (selection bias) | Unclear risk | Randomised; method not described |
Allocation concealment (selection bias) | Unclear risk | Details not given |
Blinding (performance bias and detection bias) All outcomes | Low risk | No biochemical validation but interventions of similar intensity; differential misreport judged to be unlikely |
Incomplete outcome data (attrition bias) All outcomes | High risk | Only baseline smokers who responded to follow‐up survey included in analysis |