Methods
REGRESSION, SECONDARY
The non-randomised non-blinded pragmatic controlled study was carried out during 2019–2020 in 15 prisons with 91 parents throughout Sweden. Group allocation was based on the set operation planning at each prison. Prisons delivering FOCS during the study period were recruited to the intervention group, whereas prisons delivering FOCS later were recruited to the control group. Outcomes were measured through parent-report at baseline September-December 2019 (T0), after intervention (T1) in January-April 2020, and at three-months follow-up in April-July in 2020 (T2). The primary outcome was relationship quality between incarcerated parent and child and secondary outcomes were criminal attitude, interest in other treatment programmes, and child-parent contact. Fidelity to intervention delivery was monitored through objectively rated audio recorded sessions by researchers, and by group-leader-reported logs. Group differences on outcome over time and at each time point were explored using mixed-model regression with repeated measures with an intention-to-treat approach and per protocol.