Table 1 Demographic characteristics and comorbidity in USA vs Europe
|  | USA (n = 332, 70.8%) | Europe (n = 137, 29.2%) | Total (n = 469, 100%) | χ2 | p-value |
|---|---|---|---|---|---|
Gender | |||||
 Female | 59.9 | 52.6 | 57.8 |  |  |
 Male | 40.1 | 47.4 | 42.2 | 2.17 | 0.141 |
Income ($) | |||||
 < 20,000 | 38.9 | 36.5 | 38.2 |  |  |
 20,000–59,999 | 38.6 | 42.3 | 39.7 |  |  |
 > 60,000 | 22.6 | 21.2 | 22.2 | 0.58 | 0.748 |
BD type | |||||
 BD I | 84.3 | 83.2 | 84.0 |  |  |
 BD II | 13.6 | 15.3 | 14.1 |  |  |
 BD cyclothymic | 2.1 | 1.5 | 1.9 | 0.44 | 0.081 |
Comorbidity | |||||
 AnxD | 52.7 | 28.5 | 45.6 | 22.98 | < 0.001 |
 Panic disorder | 35.8 | 19.7 | 31.1 |  |  |
 Chronic AnxD | 33.4 | 16.8 | 28.6 |  |  |
 OCD | 22.9 | 4.4 | 17.5 |  |  |
 ADHD | 16.6 | 6.6 | 13.6 | 8.23 | 0.004 |
 SUD | 47.3 | 24.8 | 40.5 | 20.29 | < 0.001 |
 AnxD + SUD | 26.2 | 9.5 | 19.2 |  |  |
 ADHD + SUD | 9.9 | 2.9 | 7.9 |  |  |
 ADHD + AnxD | 13.3 | 5.8 | 11.1 |  |  |