BMC Public Health 2008, 8:103 http://www.biomedcentral.com/1471-2458/8/103 Allocated to inter vention (n= ) Received allocated intervention at _ time point (n= ) Did not receive allocated intervention at _ time point (n= ) Give reasons Follow- up Returned questionnaire at _ scheduled time point (n= ) Lost to follow up (n= ) Give reasons Discontinued intervention (n= ) Give reasons Analyzed (n= ) Excluded from analysis (n= ) Give reasons SFtiugduyrede1sign Study design. Eligable Bir ths (n = ) Contacted at __ week first-time parent group meeting across 12 VictorianELoxccalluGodveerdnm(ennt =Are3a1s5) Fir st-time par ent gr oup expr essed inter est to r esear ch team (n = ) Enr olment (Consent form returned) (n = _ families, n = _ first-time parent groups) Excluded (n = ) Not meeting inclusion criteria (n= ) Refused to participate (n= ) Other reasons (n= ) Randomisation Allocation Follow- Up Analysis Allocated to Contr ol (n= ) Received ‘usual care’ at _ time point (n= ) Did not receive ‘usual care’ at _ time point (n= ) Give Reasons Follow- up Returned questionnaire at _ scheduled time point (n= ) Lost to follow up (n= ) Give reasons Discontinued control (n= ) Give reasons Analyzed (n= ) Excluded from analysis (n= ) Give reasons Sample size A sample of 600 first time parents participating in first- time parents' groups (300 in each arm) will be recruited for the study. The sample size calculation is based on detecting changes in one of the main outcomes: dietary intake. The authors are not aware of any data providing means and standard deviations on physical activity, sed- entary behaviours or body mass index in this age group. Page 5 of 9 (page number not for citation purposes)