Table 1.
Studies of the prevalence of unrecognised bipolar disorder in primary care
| Study | Country | Method | Prevalence rate (95% CI) | |
|---|---|---|---|---|
| Manning et al 7 1997 | US | Diagnostic interview | 19.0 (12.6 to 27.7) |
|
| Sansone et al 8 1998 | US | Diagnostic interview | 12.8 (5.4 to 27.3) | |
| Hirschfeld et al 9 2003 | US | MDQ | 2.0 (1.9 to 2.1) | |
| Hirschfeld et al 10 2005 | US | MDQ | 16.5 (13.7 to 19.9) | |
| Das et al 11 2005 | US | MDQ | 9.1 (7.5 to 10.9) | |
| Awad et al 12 2007 | US | Brief questionnaire | 14.3 (12.4 to 16.4) | |
| Kamat et al 13 2008 | US | MDQ | 6.9 (5.7 to 8.4) | |
| Vermani et al 14 2011 | Canada | Brief diagnostic interview | 10.7 (8.8 to 13.0) | |
| Chiu and Chokka15 2011 | Canada | MDQ | 27.9 (25.5 to 30.4) | |
| Castelo et al 16 2012 | Brazil | MDQ | 7.3 (5.6 to 9.4) |
MDQ = Mood Disorder Questionnaire. Those studies recruiting from secondary care are not included unless data are given separately for primary care. Patients with recognised bipolar disorder are removed from the denominator. Where data are supplied, the rate for bipolar I and II only is used, rather than the rate for the broader bipolar spectrum.