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ADD, Attention Deficit Disorder, is the original classification created to identify difficulties with attention and focus caused by a neurological chemical imbalance. Later, the classification of AD/HD, Attention Deficit Hyperactivity Disorder, was created to identify difficulties with attention and hyperactivity. Today, ADD is considered a subtype of AD/HD, denoted as AD/HD-Inattentive Type, whereas hyperactivity is denoted as AD/HD-Hyperactive Type. A combination of these to conditions is denoted as AD/HD-Mixed. This type of sub-classifications are similar in purpose and nature to the sub-classifications associated with Dyslexia. ADD is highly co-morbid (occurring simultaneously) with Dyslexia. The co-morbidity rate is between 30 and 40%, which is why a dual evaluation is often desirable. Most people (67%) with ADHD are actually diagnosis with ADHD-Inattentive Type (ADD), while the remainder are diagnosed with ADHD-Hyperactive (16%) and/or ADHD-Mixed Type (17%). ADHD/ADD can present dyslexic-like literacy deficit and sequencing symptoms in Pre-K to 8th grade students; although it is more common for dyslexia to be misinterpreted as ADD.
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