Epidemiology Characteristics of Constipation for General Population, Pediatric Population, and Elderly Population in China

Table 3

Characteristics of included papers (in elderly population).

Author	Area of origin	Population	Year of publication	Diagnosed criteria	Number of investigated people	Number of patients	Quality score
Li et al. [85]	Beijing City	>60 years	2000	Strain or hard or <3 BMs/week	1434	291	4
Cai et al. [86]	Nanjing City	>60 years	2004	Strain or hard or <3 BMs/week	3731	897	3
Yu et al. [65]	Beijing City	>60 years	2001	Strain or hard or <3 BMs/week	8252	950	4
Pan and Shen [87]	Beijing City	>60 years	2008	Rome II	114	45	4
Liu et al. [19]	Tangshan City	>60 years	2007	Strain or hard or <3 BMs/week	545	369	3
Guo et al. [88]	Tianjin City	>70 years	2004	Strain or hard or <3 BMs/week	76	32	3
Huang and Zhang [89]	Sichuan Province	>60 years	1999	<3 BMs/week	741	115	4