Table 2.

Diagnosis history of adults with ADHD in Europe and the US

	Germany (n=100), %	Northern Europe (n=130), %	UK (n=101), %	Europe (n=331), %	US (n=100), %
Prior to diagnosis, consulted with
PCP	49.0	48.5	63.4	53.2	42.0
Psychiatrist	54.0	62.3	45.5	54.7	50.0
Psychologist	43.0	53.9	33.7	44.4	35.0
Pediatrician	10.0	8.5	8.9	9.1	8.0
First diagnosed bya
PCP	19.0	17.1	41.6	25.2	29.0
Psychiatrist	51.0	50.4	26.7	43.3	45.0
Psychologist/therapist	21.0	23.3	10.9	18.8	20.0
Pediatrician	6.0	3.9	4.0	4.6	3.0
Time to first diagnosisa
At first visit	28.6	16.2	10.8	18.6*	42.1
Within 6 months (but not at first visit)	33.0	38.5	36.1	36.1*	47.7
Diagnoses prior to initial ADHD diagnosis
Depression	58.0	46.9	45.5	49.9	50.0
Anxiety	43.0	22.3	33.7	32.0	34.0
Alcoholism	15.0	7.7	11.9	11.2	7.0
Other substance abuse	11.0	13.1	7.9	10.9	11.0
Conduct disorder	36.0	20.0	6.9	20.9*	5.0
Learning disability	26.0	15.4	15.8	18.7	17.0
Bipolar disorder	9.0	9.2	11.9	10.0	10.0
Schizophrenia	4.0	2.3	5.0	3.6	1.0
Autism	5.0	10.8	13.9	10.0*	1.0
Asperger syndrome	6.0	7.7	15.8	9.7*	1.0
Any other mental health conditions	11.0	13.1	7.9	10.9	7.0
Patient experience with ADHD diagnosis
Took too long to get ADHD diagnosis	62.8	46.8	46.7	51.6*	39.0
PCP not knowledgeable about ADHD	47.8	30.8	29.2	35.7	40.5
Had difficulty getting referrals	34.6	27.0	40.5	33.2	22.4
PCP hesitant to diagnosis ADHD	46.6	35.0	39.8	40.2*	25.8

Notes:

^*Significant differences between respondents with and without ADHD in Europe and the US (P<0.05);

^aa test for the difference between Europe and the US was performed for the variable itself, not for each category of the variable.

Abbreviations: ADHD, attention-deficit/hyperactivity disorder; PCP, primary care physician.