Table 1.

Studies evaluating overdiagnosis

Author(s) (year)	Diagnosis	N	Study	Result
First group of studies: re-evaluating former diagnoses
Chilakamarri and Filkowski (2011) [26]	ADHD, BD, MDD (DSM-IV)	n = 64 patients (age 7–18)	Re-evaluation of former diagnoses at intake in a community primary care mental health setting	Overdiagnosis of ADHD, underdiagnosis of BD, over- and underdiagnosis of MDD
Cotugno (1993) [27]	ADHD (DSM-III-R)	n = 92 patients (age 5–14)	Re-evaluation of former diagnoses at intake in a specialized ADHD clinic	22% of former ADHD-cases were given a primary diagnosis of ADHD, 37% a secondary diagnosis of ADHD
Ezpeleta et al. (1997) [24]	DSM-III-R diagnoses	n = 137 patients (age 6–17)	Agreement between clinician-generated diagnoses at intake in an outpatient clinic and diagnoses given after a clinical interview	Low to moderate agreement
Jensen and Weisz (2002) [25]	DSM-III-R diagnoses	n = 245 patients (age 7–17)	Agreement between clinician-generated diagnoses at intake in an outpatient clinic and diagnoses given after a clinical interview	Low agreement, more diagnoses after clinical interview
Krasa and Tolbert (1994) [18]	BD (DSM-III-R)	n = 53 patients (age 13–18)	Re-evaluation of diagnoses after discharge from an inpatient psychiatric service	28.3% received an other diagnosis after re-evaluation (MDD, organic mood disorder, schizophreniform disorder, posttraumatic stress disorder, conduct disorder, ADHD, developmental receptive language disorder)
Lewczyk et al. (2003) [28]	DSM-IV diagnostic categories	n = 240 patients (age 6–18)	Agreement between discharge diagnoses generated by county mental health providers and diagnoses given after a clinical interview	Low overall agreement; higher prevalence of ADHD, disruptive behavior disorder and anxiety disorders based on clinical interview; higher prevalence of mood disorders based on clinical diagnoses
McClellan et al. (1993) [19]	Psychotic disorders (DSM-III-R)	n = 39 patients (age 7–17)	Re-evaluation of diagnoses given at an inpatient psychiatric clinic after m = 3.9 years	Diagnoses changed at follow up: 46% of schizophrenia, 66% mood disorder, 40% personality disorder
McKenna et al. (1994) [29]	Schizophrenia (DSM-III-R)	n = 71 patients (age 8–18)	Re-evaluation of diagnoses given at major academic centers	73% received a diagnosis other than schizophrenia after evaluation
Pogge et al. (2001) [20]	BD (DSM-IV)	n = 29 patients (age mean 15.18)	Agreement between clinical chart diagnoses at psychiatric inpatient clinic and research-quality assessment, involving structured interviews	40% of clinical chart diagnoses confirmed by research-quality assessment 79% of research-quality diagnoses confirmed by clinical-chart diagnoses
Safer (1995) [21]	DSM-III-R diagnoses	n = 82 youth patients	Comparison between inpatient and subsequent outpatient diagnoses	Low agreement, inpatient: mostly mood-disorder diagnosis, outpatient: mostly disruptive behavior disorders
Sevin et al. (2003) [30]	DSM-IV diagnoses	n = 150 adolescents (age 11–19) with developmental disabilities	Comparison between pre-admission diagnoses and diagnoses made in a dual diagnosis treatment unit, serving adolescents with a developmental disability and a mental disorder	Less externalizing, psychotic and mood disorders after re-evaluation, more Tic and substance related disorders
Vitiello et al. (1990) [22]	DSM-III diagnoses	n = 46 patients (age 6–13)	Agreement between chart diagnoses in a child psychiatry inpatient unit, diagnoses given after structured clinical interviews with the child and the patient’s parents and review diagnoses given after discharge by reviewing all relevant information regarding the child’s psychopathology	Disagreement between chart and structured interview diagnoses in 1/3 of cases Agreement between review-diagnoses and chart diagnoses: 67% Structured interview (parents): 87% Structured interview (children): 69%
Werry et al. (1991) [23]	Psychotic disorders (DSM-III-R)	n = 61 patients (age 7–17)	Re-evaluation of former diagnosis after m = 5 years	55% of bipolar diagnoses at follow up had a former diagnosis of schizophrenia
Wiggins et al. (2012) [31]	ASD (DSM-IV-TR)	n = 1392 child patients	Analysis of data from education and health records in surveillance years 2000 and 2006	4% changed in classification to non-ASD (mostly to language delay or disorder or other specific developmental delay)
Wittchen et al. (1998) [32]	Agoraphobia (DSM-IV)	n = 173 patients (age 14–24)	Re-evaluation of structured interview diagnosis by clinical psychologists	Agoraphobia diagnosis was confirmed in 13.9% of cases; mostly patients received specific phobia diagnoses after re-evaluation
Woolfenden et al. (2012) [33]	ASD (DSM-III–DSM-IV-TR, ICD-9, ICD-10)	n = 1466 child patients	Review of 23 studies concerning stability of ASD diagnoses	Moving out of the ASD spectrum at follow up with a former autistic disorder diagnosis (other ASD) Baseline age <3 years: 0–30% (0–53%) Baseline age 3–5 years: 0–20% (0–5%) Baseline age >5 years: 0–16% (0–23%)
Second group of studies: designs able to prove overdiagnosis
Bruchmüller et al. (2012) [34]	ADHD (DSM-IV, ICD-10)	n = 463 German child and adolescent psychotherapists	Evaluating case-vignettes fulfilling/not fulfilling criteria of ADHD	16.7% diagnosed ADHD, although criteria were not fulfilled vs. 7.0% not diagnosed with ADHD although criteria were fulfilled

ADHD attention-deficit/hyperactivity disorder, ASD autism spectrum disorder, BD bipolar disorder, MDD major depressive disorder