This case control study compared the outcomes from two service evaluations (IT Malta and IP UK) and a matched group from a UK based CMHT. The organisational setup of the IT Malta service was mapped onto IP UK, meaning the team consisted of a multidisciplinary team (MDT) having different child and adolescent mental health training backgrounds. The same protocol used in IP UK was amended and adapted for use in IT Malta (Camilleri et al., 2017).
In order to decrease barriers to access, both IT Malta and IP UK accepted referrals from; GPs, social services, schools, self-referrals or walk-ins. Both IT Malta and IP UK carried out a multimodal in-depth clinical assessment which consisted of a clinical psychiatric interview carried out by a child and adolescent psychiatrist. This entailed a neurodevelopmental assessment which was substantiated by the use of the Mini-International Neuropsychiatric Interview for Children and Adolescents (MINI Kid) (Sheehan et al., 2010). A social function interview was carried out by mental health nurses or a social worker, this was substantiated by the Assessment Schedule for Adolescents (SNASA) (Kroll et al., 1999). Psychologists carried out a systemic clinical interview informed by the use of Systemic Clinical Outcome and Routine Evaluation (SCORE-15) (Stratton, Bland, Janes, & Lask, 2010).
Following the completion of the described assessment every YP would be discussed at an MDT formulation meeting, only those who met the criteria described within the service protocol for HTRYP (Camilleri et al., 2017) and deemed to be suffering from complex mental disorders would be taken on for treatment. Those YP who did not meet criteria would be discharged from IP UK or IT Malta and referred to other appropriate services. HTRYP taken on for intervention would be allocated a key worker who would be responsible for coordinating the intervention plan and ensuring appropriate liaison with external agencies. All interventions would be tailored to meet the needs of the YP (therefore were not manualised). Initially the mainstay of intervention would focus on engagement. This was followed by providing the appropriate time needed (at times more than once weekly) to apply evidence based interventions. This consisted of psychopharmacology, home visits, outreach meetings held in the community, supportive psychotherapy, cognitive behaviour therapy, dialectical behaviour therapy skills (DBT), family therapy, social worker involvement and if required admissions to in-patient units.
The outcome measures used in this study consisted of the Health of the Nation Outcome Scales for Child and Adolescent Mental Health (HoNOSCA) and Children’s Global Assessment Scale (CGAS). HoNOSCA scores are reported (Gowers, Harrington, …, & 1999, n.d.) to have good inter-rater reliability (0.82 for psychiatric symptoms and 0.42–0.62 for physical and social impairment), good test re-test reliability 0.69 (p < 0.001, two tailed Pearson correlation), interclass correlations greater than 0.8 and good face validity (Garralda, Yates, Psychiatry, & 2000, n.d.). The CGAS is widely available and reported to have good joint reliability is of 0.83–0.92 good inter-rater reliability and a useful measure of change over time (B. Green, Shirk, Hanze, …, & 1994, n.d.).
Data from IT Malta were compared with IP UK and CMHT using SPSS (S. B. Green & Salkind, 2013). YP from IP UK and CMHT were matched for age, gender, education, socioeconomic status, primary diagnosis and degree of severity of mental disorder (Camilleri et al., 2017). The Chi Squared test was used to investigate the association between two categorical variables whereas the one-way ANOVA test was used to compare mean quantitative measurements between the 3 independent groups; CMHT (UK control), IP UK (UK case), IT Malta (Malta case). The Tukey Post-HOC test was essential to compare the mean measurements between the groups two at a time.