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Table 1 Summary of the 10 Most Common Primary Diagnoses Among ADHD Patientsa

From: Economic burden and comorbidities of attention-deficit/hyperactivity disorder among pediatric patients hospitalized in the United States

Patients Aged 6-11 Years Patients Aged 12-17 Years
  Patients With a Secondary ADHD Diagnosis (n = 126,056) Patients Without an ADHD Diagnosis (n = 2,592,204)   Patients With a Secondary ADHD Diagnosis (n = 204,176) Patients Without an ADHD Diagnosis (n = 5,130,336)
Primary Diagnosis N % N % Primary Diagnosis N % N %
296: Affective psychoses 30,361 24.09 37,692 0.49 296: Affective psychoses 66,543 32.59 333,817 4.32
313: Emotional disturbances 8,297 6.58 6,584 0.09 311: Depressive disorder NEC 10,589 5.19 68,164 0.88
312: Conduct disturbance NEC 6,810 5.40 8,131 0.11 312: Conduct disturb-ances NEC 9,906 4.85 35,254 0.46
780: General symptoms 6,077 4.82 85,024 1.10 313: Disturb-ances of emotions specific to childhood and adoles-cence 7,970 3.90 19,055 0.25
493: Asthma 5,964 4.73 262,153 3.39 309: Adjustment reaction 7,576 3.71 49,583 0.64
309: Adjustment reaction 4,764 3.78 8,076 0.10 540: Acute appendicitis 5,285 2.59 281,400 3.64
540: Acute appendicitis 3,892 3.09 200,290 2.59 780: General symptoms 4,662 2.28 85,565 1.11
311: Depressive disorder NEC 3,436 2.73 6,493 0.08 300: Neurotic disorders 4,257 2.09 27,432 0.36
345: Epilepsy 2,591 2.06 35,367 0.46 969: Poisoning by psycho-tropic agents 3,853 1.89 29,352 0.38
486: Pneumonia, organism NOS 2,245 1.78 135,420 1.75 250: Diabetes mellitus 3,765 1.84 117,822 1.53
  1. ADHD = attention-deficit/hyperactivity disorder; NEC = Not elsewhere classified; NOS = not otherwise specified.
  2. a Patients with a primary ADHD diagnosis were excluded from the analysis.