In our previous blog entry, we highlighted how the #1 barrier to conducting mental health research according to the experts is a shortage of clinical interviewers. (For more details about this, see our blog, “America’s Clinical Trial Bottleneck: Interviewer Shortages in Mental Health.”  According to the 2024 “State of the Behavioral Health Workforce” report by the Health Resources and Services Administration (HRSA), the #2 barrier to conducting mental health research is the diagnostic complexity of assessing mental disorders. These challenges impact clinical trials by making participant selection difficult and inflating placebo responses in the outcome data.   Why Is It Complex to Assess Mental Disorders? There are several important reasons for this:

1. Mental Disorders Are Heterogeneous – People with the same diagnosis can look very different from one another in terms of:

(a) the combination of symptoms they experience (b) the intensity, severity, and duration of their symptoms (c) how their symptoms fluctuate over time (c) the root causes of the mental disorder, and (d) how the mental disorder affects their lives Given this challenge, our training materials at SCID Institute aim to expose SCID® trainees to a wide variety of clinical presentations for the same disorder.

2. Overlapping Symptoms Across Disorders – Symptom crossover occurs when the same symptom appears in multiple disorders. For example, anxiety, sleep disturbances, concentration problems, and mood changes appear in multiple disorders (e.g., depression, PTSD, ADHD).

This overlap requires the DSM®, subsequently the SCID®, to use carefully designed criteria, coupled with expertly trained clinical interviewers, to distinguish one disorder from another.

3. Clinical Significance Varies by Context – Clinical significance, and not just symptom counts, is required for making diagnostic decisions for nearly all mental disorders. Clinical significance can include functional impairment, distress, or risk to self or others. A symptom might be clinically significant for one person but not another, depending on cultural norms, age, developmental stage, and life circumstances.

  Given the vital role clinical significance plays in DSM® diagnostic assessments, the SCID® includes carefully crafted probes to assess clinical significance across a variety of contexts. At SCID Institute, we ensure that our SCID trainees are experts at evaluating clinical significance for rating symptoms and diagnoses.

4. Comorbidity Is Common – Comorbidity refers to the presence of two or more mental disorders occurring in the same person either at the same time or sequentially. Many people meet criteria for more than one disorder (e.g., anxiety and depression, PTSD and substance use), which complicates making diagnoses. The DSM®, and subsequently the SCID®, are written to help clinicians tease apart primary vs. secondary diagnoses and rule-outs.

 

5. Avoiding Overdiagnosis and Underdiagnosis – The DSM helps set clear thresholds (e.g., how many symptoms, for how long, in what context) to avoid misdiagnosing the patient or participant (i.e. false positives) or missing a genuine condition (i.e. false negatives). As a companion to the DSM®, the SCID® includes carefully crafted follow-up probes to further reduce the number of false positives and false negatives when conducting psychiatric assessments.

A recent meta-analysis of mental health studies (Wu et al., 2022) found that the SCID-5 reduced false positives by 80% compared to other popular psychiatric assessments. To further reduce error, the SCID® was carefully crafted with questions designed to increase both sensitivity and accuracy of the data. SCID Institute further improves outcome data by upholding rigorous training and certification standards for clinical interviewers who complete our training program. Based on our previous experience, we can expect Excellent interrater reliability (p<.001) and minimal error in the SCID data among the clinical interviewers we at SCID Institute train and certify. The most effective solutions to diagnostic complexity are to administer the SCID® for data collection and to hire our SCID Experts to collect the highest quality data for your next clinical trial.  Contact us at SCID Institute to learn how much your next clinical trial or research study will save in time and money by administering the SCID® and employing our SCID Experts for data collection.