Implications and Mechanisms of Antiviral Effects of Lactic Acid Bacteria: A Systematic Review

Table 1

Quality assessment of the observational studies included in the meta-analysis (the NOS tool).

Author	Selection				Comparability		Outcome
	Representativeness of exposed cohort	Selection of nonexposed cohort	Ascertainment of exposure	Demonstration that outcome of interest was not present at start of study	Adjust for the most important risk factors	Adjust for other risk factors	Assessment of outcome	Follow-up length	Loss to follow-up rate	Total quality score
Li et al. [16]	1	1	1	1	1	1	1	1	1	9
Salazar et al. [17]	1	1	1	1	1	0	1	1	1	8
Ishizaki et al. [18]	1	1	1	1	1	1	1	1	1	9
Nagata et al. [19]	1	1	1	1	1	1	1	1	1	9
Irvine et al. [20]	1	1	1	1	1	0	1	1	1	8
Irvine et al. [21]	1	1	1	1	1	0	1	1	1	8
Salminen et al. [22]	1	1	1	1	1	0	1	1	1	8
Wang et al. [23]	1	1	1	1	1	1	1	1	1	9