Background: 5–10% of schoolchildren in Germany are absent from school without an excuse more than five times per year. We investigate the effectiveness of manual-based, multimodal cognitive behavioral therapy focusing on school-avoidant behavior and on the underlying mental disorders.
Methods: 112 school avoiders were recruited from an outpatient child and adolescent psychiatric clinic and adaptively randomized into two treatment groups. The first group received manual-based multimodal treatment (MT), the second group treatment as usual (TAU) in the child and adolescent mental health care system. The primary outcome of the study was the percentage of classes attended in the five days prior to first measurement (before the intervention), as well as 6 and 12 months afterward. In each of these periods, school attendance was characterized as regular, partial, or none. Secondary outcomes were the severity of anxiety and depressive symptoms, self-efficacy, and quality of family life.
Results: In both treatment arms, the percentage of regular school attenders rose to about 60% in 6 months, regardless of the intervention (MT 60.6%, TAU 58.3%; odds ratio [OR] for changes over baseline 6.94, 95% confidence interval [CI] 3.98–12.12, p<0.001; OR for MT versus TAU 1.05, 95% CI 0.58–1.90, p = 0.875). The improvement persisted 12 months after inclusion.
Conclusion: In accordance with earlier studies, we found that manual-based multimodal treatment did not improve school avoidance to any greater extent than treatment as usual. Future studies should focus on the conditions for successful reintegration in school and on the differential indicators for outpatient versus inpatient treatment.
Absenteeism from school is associated with the risk of stopping one’s educational career (1) and is accompanied by an increased risk for failing school, unemployment, and mental disorders (2, 3). Five to 10% of German school students are absent from school to a substantial extent (>5 times unexcused absence/school year) (4, 5). School absenteeism that is accompanied by psychiatric symptoms is defined as school avoiding behavior (6–8). All these factors contribute to the need to evaluate effective treatment strategies.
Two longitudinal studies reported successful outcomes for inpatient or outpatient cognitive behavioral therapy (CBT) with regard to psychopathology and school attendance. Walter et al. (, Germany) showed an increase in the proportion of regular school attenders to 87.1% subsequent to inpatient CBT. Heyne et al. (, Australia) achieved a school attendance rate of 40.5% in the outpatient setting. The patients primarily had anxiety and/or depressive disorders. According to Maric et al. (11), the improvements in the study reported by Heyne et al. (10) can partly be explained by the mediating effect of self-efficacy, which is associated with improved school performance (12).
To date, three randomized controlled trials (RCTs) have investigated the effects of CBT on school attendance. King et al. (13) showed that for patients with anxiety disorders, CBT was superior to waiting list conditions as regards school attendance (n=2×17 patients). Last et al. (14), however, found overall improvements in school attendance for patients with school phobia (separation anxiety), who were randomized to either CBT or psychoeducation treatment (n=32 and n=24), but they observed no differences between groups. A comparison between groups showed significantly stronger improvements in anxiety symptoms in patients in the psychoeducation group; depressive symptoms reduced significantly in the CBT group. A comparison of CBT, parent–teacher training, and a combination of both approaches for patients with primary anxiety disorder was undertaken by Heyne and colleagues in Australia (15) (n = 21 versus n = 20 versus n = 20; RCT). Differences between groups did not reach significance at 4.5 months after the end of the treatment.
The present study evaluated a multimodal, multiprofessional behavioral therapeutic treatment strategy (manual-based multimodal treatment [experimental group]) compared with treatment administered by child and adolescent psychiatrists in private practice in the regular mental health care system (treatment as usual [control group]). Before the start of treatment as well as at six and 12 months’ follow-ups we reviewed:
The study has a randomized controlled parallel group design with three measurement points at six month intervals each. Patients were recruited from the clinical special outpatient department for children and adolescents with school avoiding behavior at the LVR-Hospital Essen. Box 1 lists the inclusion and exclusion criteria. On the basis of the RCTs conducted so far, we initially planned this study with a continuous outcome. We planned the number of cases on the basis of an assumed effect size of 0.25 for the treatment difference relating to the continuous outcome “proportion of school lessons attended within the five school days preceding the measurement point.” By using a sample size of 156 patients, the assumed between-group difference can be identified by using analysis of covariance (ANCOVA; F test) under consideration of the observed outcome at the previous measurement point as a covariate, and of a two-sided significance level of 5% and a power of 80% (G*Power, version 220.127.116.11). Patients were adaptively randomized centrally by an independent center (the Centre [sic] for Clinical Studies at Essen University Hospitals); they were stratified by sex and age younger/older than 15 years by using a biased coin method. Randomization was computer aided by the RITA (randomization in treatment arms ) program. The study was approved by the relevant ethics committee.
Intervention: Manual-based multimodal treatment
Patients in the manual-based multimodal treatment (experimental) group received multimodal treatment. The specified CBT is targeted at school avoidance and the underlying psychological disorder in equal measure. The manual comprises four modules (17), of which the module “cognitive behavioral therapy” is considered to be the most important. Since school avoiders are hard to motivate on the one hand, but present with a wide range of psychological/psychiatric disorders on the other hand, the main emphasis of the manual is placed on the motivational and planning phase of the treatment (Box 2; further information on the diagnostic evaluation and treatment according to the manual is in the eBox).
The module “family counseling” included several supportive and educational interventions for parents and children. The interventions of the module “school-related conseling” included the school’s perspective on school avoidance, and the module “psychoeducational exercise program” aimed to strengthen students’ existing physical fitness and teach psychosocial competencies.
Intervention: Treatment as usual
Patients in the treatment as usual (control) group received a recommendation after the diagnostic evaluation had been completed to seek further treatment from one of 10 collaborating child and adolescent psychiatrists in private practice. Depending on the treating psychiatrist and on the psychiatric treatment approach, these patients (in accordance with the cooperation agreement) received within four weeks either psychodynamic, behavioral, or systemic therapy, and/or psychopharmacotherapy, initially in the outpatient setting.
Definition of study outcomes
The primary outcome was the ordinal-scale proportion of attended school lessons within the five days preceding the measurement points at the beginning of the study, after six months, and after 12 months. Owing to the distribution of the primary outcome (accumulations at 0 and 100%), we arranged—in a change to our original study protocol—the primary outcome into an ordinal scale, consisting of “no” (<10%), “partial” (≥10%+<90%), or “regular” (≥90%) school attendance. The primary outcome as well as additional outcomes and measures are described in eTable 1.
The above mentioned questionnaires to collect data on outcomes were administered at the first measurement point (T1), and at 6 months (T2) later, in a face to face interview. The same questionnaires were used for the telephone interview (T3), at 12 months after T1. In order to keep the extent of the assessment at T3 manageable, we did not use the version of the child behavior checklist 4–18 (CBCL) for parents; neither did we use the symptom checklist 90-R (SCL-90-R) except for the scales “depression” and “anxiety.”
We analyzed the data on the basis of the intention to treat cohort. The primary outcome was marginally modeled in a proportional odds model, based on the method of generalized estimating equations (GEE; ). To evaluate the treatment difference we included the baseline/follow-up measurement points (T1–T3) and the interaction between treatment and follow-up measurement point in the model. For the purposes of analyzing our secondary outcomes we examined the factors treatment, baseline/follow-up measurement points, and their interaction in a linear mixed model with an unstructured covariance matrix (29). We did not adjust for multiple testing, and all p values are strictly descriptive.
In order to analyze a possible bias to the results due to missing data, we compared non-response structures in both treatment groups, compared characteristics of patients with and without missing data, and, in addition to an analysis of all available cases (AAC; that is, T1–2, T1–3 or T1–2–3), we also evaluated imputed datasets. Under the assumption “missing not at random,” we assumed for the non-monotonic, missing data of the primary outcome the value “no school attendance” (worst case imputation). For the normally distributed additional outcomes, we multiply imputed under the assumption “missing at random” on the basis of the Markov Chain Monte Carlo (MCMC) technique (; multiple imputations (MI); five imputations). Furthermore we applied the “last observation carried forward” (LOCF) approach to all outcomes. We analyzed our data by using the software package SAS, version 9.4.
Recruitment and study dropouts
Between January 2011 and October 2012, 247 patients from the outpatient clinic for school avoiders and their main caregivers consecutively participated in a screening examination (Figure). 112 patients were included in the study.
Our analyses of the dropouts did not show any differences (p>0.05) between regular study participants and dropouts with regard to variables such as age, sex, socioeconomic status, school attendance, psychopathology, or group membership. There were, however, indications that patients with externalizing disorders participated in the 1-year follow-up to a lesser degree than anticipated (χ2 = 5.133; p = 0.077).
Sociodemographic data, morbidity, and take-up
The mean age of the entire sample was 14.8 years (range 8.2–19.7 years). 34% of patients were female. The students came from all school types; 33% came from intermediate secondary schools and 33% from university preparatory high schools (eTable 2). We did not find any between-group differences regarding socioeconomic variables between the experimental group and the control group. In 51.8% of patients, a diagnosis of behavioral and emotional disorders with onset usually occurring in childhood and adolescence was made, followed by neurotic, stress-related, and somatoform (47.3%) and mood disorders (27.7%); eFigure 1; multiple diagnoses applied to 42.9% of patients. No differences between groups were seen for the diagnoses nor for the diagnostic criteria (eFigure 2).
In the six months before inclusion in the study, two patients in the experimental group had spent a total of 49 days in inpatient psychiatric treatment; in the control group, one patient had spent 40 days in inpatient psychiatric treatment. Similarly, no differences were seen in the outpatient setting for the same time period with regard to the number of patients receiving therapy and the numbers of sessions attended. In the 1-year period after inclusion in the study, 8 patients in the experimental group spent a total of 593 days, and 13 patients from the control group spent 865 days, as inpatients in a psychiatric ward for children and adolescents. In the same period, the participants in the experimental group used 1219 hours (of which 1191 in the intervention setting) and in the control group, 221 hours, of outpatient psychiatric/psychotherapeutic treatment (eTable 3).
Primary study outcome
The proportion of patients who did not attend school at all in the five days preceding T1 were 60.7% for the experimental group and 57.1% for the control group (AAC). The analysis of the treatment comparison (manual-based multimodal treatment [experimental group] versus treatment as usual [control group]) shows no difference for either treatment approach in terms of the regularity of school attendance for the observed time points. This is the case for the AAC analysis (odds ratio [OR] 1.05, 95% confidence interval [CI] 0.58 to 1.90) as well as for the evaluations using LOCF or worst case assumptions (OR 0.89, 95% CI 0.50 to 1.57; and OR 0.93, 95% CI 0.55 to 1.55, respectively).
The exploratory analysis indicates a treatment effect over time: the likelihood of increasing the frequency of school attendance at T2 is 6.9 times higher in the AAC analysis than at T1 (p<0.001). The comparison between T2 and T3 shows no change in the frequency of school attendance (OR 1.2, p = 0.708). The treatment effect between T1 and T2 is also found in the analyses under LOCF and the worst case assumptions, but the probabilities are less pronounced (T1 and T2: OR 3.5, p<0.001; and OR 1.8, p = 0.009, respectively). An interaction effect—time×group—was not observed.
Additional study outcomes
The following applies for the AAC analysis and the imputation methods LOCF and MI: the exploratory analysis of the treatment comparison (manual-based multimodal treatment [experimental group] versus treatment as usual [control group]) did not show pronounced differences for either of the imputation methods. The investigation of the treatment effect over time yielded the following results for all conditions of the analysis mentioned above: the comparison between T1 and T2 showed a reduction in the severity of the psychopathology (CBCL total value, depression, anxiety, the only exception is a trend for improvement to the “anxiety” variable in the experimental group under manual-based multimodal treatment) and a notable optimization of self-efficacy. From T2 and T3, improvements were seen in the quality of family life and in self-efficacy.
The interaction effect time×group assumed a p value of p ≤ 0.05 in the AAC and LOCF analysis only for the SCL-90-R scale “depression.” Patients in the experimental group reported a slight improvement in their depressive symptoms over time (by 2.9 points) (Table 1).
As far as we are aware, this study is the first randomized controlled evaluation of the effectiveness of a multimodal, behavioral therapy–based treatment approach for school avoiders with a wide spectrum of diagnoses.
In spite of not reaching our originally intended sample size because of the high screening dropout rate, the sample size is high compared with the cited RCTs. The distribution of the primary outcome variable (accumulation at 0 and 100%) had not been expected a priori in this form and therefore necessitated a change to our evaluation strategy, which indicates a reduced power of our study design because of the lower scaling level.
The limitations that reduce the representativeness of our study include the proportion of patients who dropped out of the screening (29.2% out of N = 247). It is possible that the low potential for change or a low motivation among some school avoiders requires that these students be visited on an outpatient basis (home visits, for example). The rapid chronification of school avoidance (32) is the reason for the absence of a waiting list group; however, King et al. (13) showed an improvement in rates of school attendance for CBT patients compared with waiting list patients, in whom school attendance rates did not change.
The dropout rate between follow-up points of 44.6% in the experimental group and 48.2% in the control group, 12 months after T1, may lead to biased results. The fact that no significant differences were found between patients who adhered to the study and those who dropped out could possibly be explained with a lower number of cases or a reduced power of the test. According to the available studies to date, we can assume that the extent of school avoidance in patients who were not reached by the follow-up remained the same (see for example ). Even so, we analyzed our data using a number of different assumptions and imputation methods. The most conservative assumption (worst case) assumed that patients who did not attend follow-up did not attend school at all.
Results for outcome variables
Contrary to expectations, no between-group differences were seen for the primary outcome. The results of the present study are therefore consistent with those reported by Last et al. (14) and Heyne et al. (15), who similarly did not find any differences between different treatment approaches. The data analysis under intention-to-treat (ITT) conditions possibly leads to a leveling-out of possibly existing differences between groups. Under all assumptions, the school attendance rate increases, especially in the first 6 months after the start of the treatment. It is possible that the odds of regular school attendance are subject to overestimates under the AAC assumption and to underestimates under the conservative worst case assumption. The LOCF analysis showed 3.5 times higher odds of attending school regularly again during the study period.
Under the supposition that 90% attendance at school can be classified as normal (13, 33), the proportion of school attenders in this study increased from 12.5% to 65.5% (experimental group, AAC, T1–3). These values are roughly consistent with the data from a meta-analysis of psychosocial interventions by Pina et al. (34) and in the three RCTs mentioned earlier, with the exception of the study reported by King et al. (, Table 2). In our study, 34 and 8 patients in the experimental group, and 36 and 13 patients in the control group, received outpatient or inpatient treatment in the year under observation.
Notable improvements were also seen for the additional outcomes in both groups, as early as in the first 6 months. Similarly to the study reported by Last et al. (14), the reduction of depressive symptoms over time was more pronounced in the experimental group. As the effect size of this difference in trend in the experimental group is small (Cohen’s d = 0.3), the results should be interpreted with caution.
The study shows at best a slight advantage for the patients treated according to the manual—with nominally, but not substantially, reduced healthcare costs in the first year under inclusion in the study (manual-based multimodal treatment: about €7200; treatment as usual: about €9300); Weschenfelder et al., in preparation). In addition to the analysis of conditional factors for a successful return to school, future RCTs with larger sample sizes are needed, in order better to understand the complexity of the issue. In order to increase effectiveness and lower costs, differential indications for outpatient versus inpatient treatment would be desirable.
The reported study was registered with the German Clinical Trials Register (DRKS-ID: DRKS00000738). The authors thank the federal state of North Rhine–Westphalia and the European Union for financial support (GW 187). Special thanks from the authors for realizing the study go to: H. Frey, J. Helmig, S.Kiessling, S. Mushoff-Küchenmeister, M. Schmitz, C. Ose, S. Spie, P. Vasen und A. Wertgen, as well as the collaborating child and adolescent psychiatrists.
Conflict of interest statement
Dr. Dr. Reissner, Professor Hebebrand, and Dr. Kollmann are the editors of the therapy manual evaluated in this study. The manual is published by Kohlhammer Verlag.
The remaining authors declare that no conflict of interest exists.
Manuscript received on 7 April 2015, revised version accepted on
14 July 2015.
Translated from the original German by Birte Twisselmann, PhD.
Dr. med. Dr. phil. Volker Reissner
Klinik für Psychiatrie, Psychosomatik und Psychotherapie
des Kindes- und Jugendalters
Kliniken und Insitut der Universität Duisburg-Essen,
45147 Essen, Germany
eBox, eTables, eFigures:
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