Table 4.

Quality Appraisal of Included Articles

	Selection bias	Study design	Confounders	Blinding	Data collection method	Withdrawals and dropouts	Global rating
Alessi et al.43	3	1	1	2	1	1	2
Alessi et al.28	1	1	1	2	1	1	1
Birocco et al.60	3	2	3	2	3	3	3
Cheville et al.39	1	1	1	2	1	2	1
Dowling et al.31	1	1	3	2	1	1	2
Dowling et al.37	1	1	1	1	1	1	1
Ducloux et al.51	1	1	3	3	1	3	3
Espie et al.44	1	1	1	2	1	1	1
Fetveit et al.34	1	2	3	2	1	1	2
Fetveit et al.35	1	2	3	2	1	1	2
Fetveit et al.36	1	2	3	2	1	1	2
Feng et al.56	1	1	2	3	1	1	2
Fleming et al.45	1	1	1	2	1	1	1
Innominato et al.64	1	2	2	2	1	2	1
Karaday et al.66	1	2	1	1	1	1	1
Kwekkeboom et al.46	2	2	2	2	2	2	1
Low et al.47	2	1	1	2	2	1	1
Rasmussen et al.65	2	1	2	1	1	2	1
McCurry et al.27	3	1	1	2	1	1	2
McCurry et al.29	1	1	1	2	1	2	1
McCurry et al.67	1	1	1	2	1	2	1
Milbury et al.54	2	2	1	3	1	2	2
Milbury et al.55	3	2	1	3	1	2	3
Milbury et al.48	3	1	1	2	1	3	3
Mosher et al.49	3	1	1	2	1	1	2
Ouslander et al.26	1	1	1	2	1	2	1
Palesh et al.50	2	1	3	2	2	1	2
Park et al.63	1	2	1	2	1	1	1
Plaskota et al.52	2	2	1	2	1	3	2
Royer et al.32	3	2	3	1	2	1	3
Savard et al.42	2	1	1	2	2	1	2
Simeit et al.30	2	2	3	2	2	1	2
Sloane et al.33	2	1	1	2	1	1	1
Soden et al.58	2	1	2	3	1	1	2
Swenson et al.40	3	2	2	3	2	3	3
Tang et al.59	3	1	2	1	1	2	2
Tang et al.41	2	1	3	2	1	2	2
Tsay and Chen57	1	1	1	2	1	1	1
Toth et al.61	3	1	3	3	1	1	3
Vilela et al.53	3	2	2	2	3	2	3
Weze et al.62	2	2	1	2	1	3	2
Young-McCaughan et al.38	3	2	1	2	1	2	2