[Retracted] Correlation between Pain Scores and Disc Height Changes after Discectomy in Patients with Lumbar Disc Herniation: A Systematic Review and Meta-Analysis

Table 2

Quality assessment based on Newcastle-Ottawa scale (NOS).

Study	Case selection (/4)	Comparability (/2)	Outcome indicators (/3)	Total score (/9)
Ren C [10]	4	2	3	9
Choi KC [11]	4	2	2	8
Lee JH [12]	4	2	2	8
Cho PG [13]	4	2	3	9
Wu Q [14]	4	1	2	7
Li Z [15]	4	1	2	7
Lequin MB [16]	4	1	2	7
Ledic D [17]	4	2	2	8
Parker SL [18]	4	2	3	9
Luo K [19]	4	2	2	8