Table 2.

Eligibility template - inclusion and exclusion

Article reference	(A)Inclusion
	Original studies published in peer reviewed journals	Prevalence of CP in the 40–60 age group in men and women separately	Sample selected from the general population	CP definition in line with the international association for the study of pain definition	Clearly state the country in which data was collected	Observational studies	Written in English
	Y/N	Y/N	Y/N	Y/N	Y/N	Y/N	Y/N
		(B)Exclusion
Article reference		Do not meet inclusion criteria		Reviews, conference proceedings, editorials and letters		Samples of specific groups, for example, clinical samples, population minorities
		Y/N		Y/N		Y/N