Table 1.

Table 1 Study methods and prevalence of personality disorder from recently published epidemiological studies

Author, year (ref.)	Country	Method	Prevalence (%)	Screening instrument
Huang et al, 2009 (6)	Western Europe (WE), Colombia (C),	Household surveys Multiple imputation used to	WE: 2.4	33-item screening questions
	Lebanon (L),	predict personality disorder	C: 7.9	from the International
	Mexico (M),	scores using a three part	L: 6.2	Personality Disorder
	Nigeria (N),	simulation procedure. Rates of	M: 6.1	Examination (IPDE)
	People’s Republic of China (PRC),	personality disorder calculated as means of multiple	N: 2.7
	South Africa (SA),	imputation prevalence	PRC: 4.1
	United States (US)	estimates (n=21,162)	SA: 6.8
			US: 7.6
Coid et al, 2006 (3)	England, Wales, Scotland	Survey of a stratified sample	4.4	Screening questionnaire of
		of 15,000 households (n=628)		SCID–II
Grant et al, 2004 (7)	United States of America	Random sample	14.8	Alcohol Use Disorder and
		(National Epidemiologic Survey on Alcohol and		Associated Disabilities
		Related Conditions)		Interview Schedule, DSM-IV
		(n=43,093)		Version