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Table 1 Assessment of methodological quality

From: Internet-based interventions for eating disorders in adults: a systematic review

Items Study Ljotsson et al. [16] Robinson & Serfaty [[17] Johnston et al. [15] Carrard et al. [12] Sanchez-Ortiz et al. [19] Fernandez-Aranda et al. [14] Carrard et al. [13] Ruwaard et al. [18]
Methodological quality         
Were the eligible criteria specified? yes yes yes yes yes no yes yes
Was the method of randomization described? yes yes no yes yes yes yes yes
Were the groups similar at baseline regarding important prognostic indicators? yes yes unknown yes yes yes yes yes
Were the index and the control interventions explicitly described? yes yes yes yes yes yes yes yes
Was the outcome assessor blinded to the interventions? Unknown yes Unknown no yes Unknown no Unknown
Was the dropout rate described and were the characteristics of dropouts compared with the completers? yes yes yes yes yes yes No (no comparison) no
Was long-term follow-up in the groups comparable? no no yes yes no no yes yes
Was the timing of the outcome measurements in the groups comparable? yes yes yes yes yes no yes yes
Was the sample size of each group described by means of a power calculation? no yes yes yes yes no no yes
Did the analysis include intention-to-treat analysis? yes yes no yes yes Unknown no yes
Were point estimates and measures of variability presented for the primary outcome measures? yes Mean but no standard deviation yes yes yes Mean but no standard deviation yes yes