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Table 2 Patient characteristics

From: Global impression of perceived difficulties in children and adolescents with attention-deficit/hyperactivity disorder: Reliability and validity of a new instrument assessing perceived difficulties from a patient, parent and physician perspective over the day

   Age (Years) Age at 1st occurrence of symptoms (Years) Age at 1st ADHD-diagnosis (Years)
  N (%) Mean SD Mean SD Mean SD
All patients 421 (100) 11.1 2.74 4.0 2.03 8.1 2.59
Boys 338 (80.3) 11.0 2.70 4.0 1.94 7.9 2.54
Girls 83 (19.7) 11.6 2.87 4.3 2.35 8.8 2.70
Combined subtype* 278 (66.0) 10.6 2.58 3.7 1.92 7.6 2.42
Predominantly inattentive subtype* 124 (29.5) 12.4 2.59 4.7 1.93 9.2 2.58
Predominantly hyperactive-impulsive subtype* 6 (1.4) 8.6 2.33 4.2 2.01 6.6 2.22
ADHD, not otherwise specified * 13 (3.1) 11.7 3.08 4.8 3.42 9.6 2.30
  1. * According to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition
  2. ADHD = Attention-Deficit/Hyperactivity Disorder; SD = standard deviation.