Skip to main content
. Author manuscript; available in PMC: 2019 May 29.
Published in final edited form as: N Engl J Med. 2018 Nov 29;379(22):2122–2130. doi: 10.1056/NEJMoa1806828

Figure 1. Differences in Diagnosis Rates of Attention Deficit–Hyperactivity Disorder (ADHD) According to Month of Birth.

Figure 1.

Each point represents the absolute difference in the rate of ADHD diagnosis per 10,000 children between children born in a given month and children born in the following month. For example, the “Aug. vs. Sept.” marker indicates that the absolute difference in the diagnosis rate between children born in August and children born in September was 21.5 per 10,000 children (95% CI, 8.8 to 34.0). The dashed line indicates no difference. I bars indicate 95% confidence intervals. ADHD diagnosis was defined on the basis of a diagnosis code for ADHD according to the International Classification of Diseases, 9th Revision (ICD-9), on billing claims or on the basis of a prescription filled for an ADHD medication.