3.6. Sample sizeOur sample size estimation was based on previous literature thatrecommends feasibility studies adopt sample sizes of between 24 and50 (Sim and Lewis, 2012; Julious, 2005) and a review of feasibilitystudies registered on the United Kingdom Clinical Research Network,which reported that the median sample size for studies with continuousoutcome measures was 30 (Billingham et al., 2013). Therefore, assuming a minimum of 30 participants is required in each group, andtaking into account a 20% drop-out rate observed in many psychosocialintervention studies (Van Daele et al., 2012), our target sample size was36 in each study group (i.e., 72 participants in total).