Is Dor fundoplication optimum after laparoscopic Heller myotomy for achalasia? A meta-analysis

Table 1 Checklist of quality assessment and scoring of non-random controlled studies

Checklist
Selection
Is the subject definition adequate or described? (if yes, one star)
Were the subjects representative of the total population? (one star, if truly or obviously; no stars if subjects were selected group or not described)
Comparability
Did the study have no differences between Dor fundoplication and no fundoplication or other types of fundoplication? Major factors for consideration were age, gender, symptoms, preoperative therapy (pneumatic dilation and botulin toxin injection), and preoperative diagnostic test (endoscopy parameter and barium swallow) (if yes, two stars; one star if there were no other differences between the two groups even if one or more of these five characteristics was not reported; no star was assigned if the two groups differed)
Outcome assessment
Clearly defined outcome of interest (if yes, one star)
Adequacy of follow-up (one star if less than 20% of achalasia patients lost to follow-up, otherwise no stars)