Table 2

‚ÄÉReporting of ITT principles

AuthorITT principles followed?Treatment violators?How treatment violators were managed?Missing data?How missing data were managed?
Black and Teti38NoUnclearNon-attenders were indistinguishable from non-responders.YesData were excluded, but drop outs were compared with the others for demographic variables and first visit data (baseline).
Blakemore et al39NoNoNo comment given/reported.No
Cunningham et al40NoYesNon-attenders were included in analysis where outcome data were available.YesDrop out from all three groups before and after randomisation. Data were excluded, but did detailed analysis of demographic characteristics of drop outs and participants by treatment group.
Gammon and Rose41NoNoNo comment given/reported.No
Greaves42NoNoNo comment given/reported.No
Gross et al43NoYesOne lost in treatment through illness was excluded from inferential analysis.YesEarly pre-treatment drop outs were analysed as separate control group.
Irvine et al44YesYesAll data were used where possible regardless of treatment attendance.YesThe analytical method used allowed data on individual with missing data at some time points to be included, although the missing data themselves are still not accounted for.
Joyce45NoNoNo comment given/reported.No
Koniak-Griffin et al46NoNoNo comment given.No
Lagges and Gordon47NoYesIncluded those missing some of the sessions where outcome data were available.YesExcluded all those with missing data. In addition the only two male respondents were excluded from the analysis.
McGillicuddy et al48NoYesReports overall attendance was 89%. Those missing sessions were followed up with handouts and were included where outcome data were available.YesExcluded all those with missing data and one additional parent from the skills training programme based outlier scores for parental anxiety.
Nicholson et al50NoNoThose missing a session had their session rescheduled.YesData excluded only when missing for relevant analyses.
Nixon and Singer51NoUnclearNon-attenders were indistinguishable from non-responders.YesData were excluded for drop outs
Odom52NoYesNon-attenders were excludedYesData were excluded for dropouts
Patterson et al53YesYesIncluded those missing some of the sessions where outcome data were available.YesData excluded only when missing for relevant analyses. However, exclusion is only due to non-completion of outcome measures and may not depend on treatment.
Pisterman et al54 (combined studies)NoYesUnclear whether excluded those not attending treatment.YesData were excluded for drop outs.
Pisterman et al55(study 2)NoYesLimited comment made, but did not seem to exclude those missing some of the sessions.YesData were excluded for early drop outs.
Sheeber and Johnson58NoYesNon-attender was excludedYesData were excluded for drop out
Sirbu et al59NoNoNo comment given/reported.No
Spaccarelli et al60NoYesNon-attenders were excluded.YesData were excluded for drop outs, but did an attrition analysis to see what factors affect likelihood of attrition.
Truss et al62NoYesNon-attenders were partially excluded. Those only missing sessions were analysed as separate control group.YesData were excluded for drop outs.
Taylor et al.61YesYesNon-attenders were followed up by therapist and data collected where possible. These included in analysis.YesExcluded all those with missing data (no special analysis of non-attenders, for example, sensitivity analyses).
Van Wyk et al63NoNoNo comment given/reported.No
Webster-Stratton et al64NoYesNon-attenders were excluded when missing more than 50% of sessions.YesExcluded all those with missing data.
Wolfson et al65NoNoNo apparent treatment violation.YesExcluded all those with missing data from the relevant analyses.
Zimmerman and Jacobsen66NoYesNon-attenders were excluded when missing more than two sessions.YesExcluded all those with missing data.