Erratum to: A participatory parent-focused intervention promoting physical activity in preschools: Design of a cluster-randomized trial
© De Bock et al.; licensee BioMed Central Ltd. 2012
Received: 28 March 2012
Accepted: 28 March 2012
Published: 16 May 2012
Of finally 46 eligible preschools applying for participation in the state-sponsored PA programme, we recruited 39 (86%) preschools and a total of 826 (80% of eligible) children. Nineteen and 20 preschools (with 441 and 385 children with informed consent) were randomly assigned to the intervention and control group, respectively, after stratification for aggregate SES  and geographical location. One preschool per arm left the study before baseline, leaving 433 children in 18 intervention and 376 children in 19 control preschools for analysis.
In the ethical approval, we announced a minimal number (based upon sample size calculations): 280 per arm = 560 total, but had permission from the ethics committee to recruit additional participants in preschools.
The increase in preschool and participant numbers might enable us to grasp smaller clinical differences than originally planned. However, consideration of the revised figure with respect to participant flow does not result in any qualitative change of the conclusions of our previous report.
We regret any inconvenience that this inaccuracy due to the publication of preliminary numbers of eligible and recruited preschools might have caused.
- De Bock F, Fischer JE, Hoffmann K, Renz-Polster H: A participatory parent-focused intervention promoting physical activity in preschools: design of a cluster-randomized trial. BMC Public Health. 2010, 10: 49-10.1186/1471-2458-10-49.View ArticlePubMedPubMed CentralGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2458/12/355/prepub