The present results indicate that the health care costs of children and adolescents with severe chronic pain disorders do not significantly decrease 1 year after IIPT; however, the treatment becomes more goal-focused. Differential diagnosis measures and nonindicated therapeutic interventions decreased, and more indicated interventions, such as psychotherapy, were used. Future research is needed to investigate the economic long-term changes after IIPT.

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IMPORTANCE Severe chronic pediatric pain causes individual suffering and significantly affects social functioning and psychological well-being. For children with high pain severity, intensive interdisciplinary pain treatment (IIPT) is a well-established treatment. However, across specialized centers, it is not sufficient for all patients.OBJECTIVE To evaluate the effectiveness of a psychosocial aftercare (PAC) program for pediatric patients with severe chronic pain followed up for 6 months after discharge from IIPT. DESIGN, SETTING, AND PARTICIPANTSThis multicenter randomized clinical trial with 4 assessment points (pre-IIPT, immediately post-IIPT, 3 months, and 6 months) was conducted at 3 pediatric specialized tertiary care pain centers in Germany between September 11, 2018, and March 31, 2020. Included patients were aged 8 to 17 with a severe chronic pain condition who had been admitted for IIPT. Data were analyzed from June 8 to September 4, 2020. INTERVENTIONS Patients and their families were randomly assigned to 1 of 2 study groups at inpatient IIPT admission. Both groups received standardized 3-to 4-week IIPT. After IIPT discharge, the intervention group received PAC and the control group received usual care. PAC involved ongoing contact with a social worker for as long as the family requested the support, up to a maximum of 6 months. MAIN OUTCOMES AND MEASURES The primary outcome measure was pain at 6 months, measured using the Chronic Pain Grading (CPG), an instrument based on an algorithm indicating severity of the chronic pain disorder. Secondary outcomes included other pain-related and emotional parameters. RESULTS A total of 419 patients were randomized (mean [SD] age, 14.3 [2.1] years; 303 [72.3%] girls; 116 [27.7%] boys), with 218 assigned to usual care and 201 assigned to PAC. At baseline in both groups, the median (IQR) CPG was 3 (2-4). Superiority of PAC compared with usual care was demonstrated at 6 months (median [IQR] CPG: usual care, 2 [2-3]; PAC, 1 [1-2]; r = 0.30; 95% CI, 0.17-0.41). Additionally, PAC significantly improved emotional parameters (eg, significant time × group interaction: b = −8.84; P < .001). CONCLUSIONS AND RELEVANCEThis randomized clinical trial found that PAC improved painrelated and emotional parameters during the intervention 6 months after discharge from IIPT. Future research is needed to investigate the intervention's long-term effects. (continued) Key Points Question Does a psychosocial aftercare program (PAC) after in-hospital intensive interdisciplinary pain treatment (IIPT) for pediatric patients with chronic pain improve functional outcomes? Findings In this randomized clinical trial including 419 patients aged 8 to 17 years randomized and 222 patients analyzed at 6 months, PAC significantly improved all pain-related as well as emotional outcome parameters compared with treatment as usual. Meaning These findings suggest PAC should be considered in IIPT for pediatric chronic pain and its effectiveness tested in other pediatric psychosomatic conditions.

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