Table 1.

The characteristics of the included studies.

First author	Year	Country	Age group	Number.		Outcome	Quality	Study design
				EG	CG
M. Kopczynska	2018	UK	Adults	157	54	Plasma CRP level	7	Case-control
NA. Meguid	2018	Egypt	Children	30	30	Serum CRP level	7	Case-control
NC Chen	2018	China	Adults	120	40	Blood hs-CRP level	7	Case-control
TC Zhou	2018	China	Adults	58	58	Serum CRP level	6	Case-control
C. Liguori	2017	Italy	Adults	37	20	Serum CRP level	6	Case-control
Kentaro	2017	Japan	Adults	11	8	Serum hs-CRP level	7	Case-control
EP Półtorak	2016	Poland	Adults	21	21	Serum hs-CRP level	6	Case-control
JS Yeom	2016	South Korea	Adults	29	173	Serum CRP level	6	Case-control
A Farhang	2015	Iran	Adults	40	20	Serum CRP level	7	Case-control
N Ishikawa	2014	Japan	Children	29	15	Serum hs-CRP level	7	Case-control
FM. Talaat	2014	Egypt	Adults	40	20	Serum hs-CRP level	7	Case-control
N Sankhyan	2013	India	Children	58	58	Serum hs-CRP level	7	cross-sectional
T Alapirtti	2012	Finland	Adults	31	80	Serum CRP level	8	Case-control
YC Chuang	2011	China	Adults	160	60	Serum hs-CRP level	7	Cross-sectional
S Mintzer	2009	USA	Adults	34	16	Serum CRP level	7	Case-control
TY Tan	2009	China	Adults	195	195	Blood hs-CRP level	7	Case-control