Table 1.

Tools for assessing the quality of studies included in this systematic review.

Scale	Examined Study	Questions	Scores Range
Amstar	Systematic Reviews	N.11 (yes, no, cannot answer, not applicable)	0–11 pt
Insa	Narrative Reviews	N.7 (yes, no)	0–7 pt
Jadad	Randomized Trials	N.3 (yes, no)	0–5 pt
New Castle Ottawa	Case- Control	Selection N.4, Comparability N.1, Exposure N.3 (yes/no)	0–8 pt
New Castle Ottawa	Cross sectional	Selection N.4, Comparability N.1, Outcome N.2 (yes/no)	0–10 pt
New Castle Ottawa	Cohort Studies	Selection N.4, Comparability N.1, Outcome N.3 (yes/no)	0–8 pt