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Table 2 Quality assessment of case-control studies included by NOS

From: Noninvasive ventilation with helmet versus control strategy in patients with acute respiratory failure: a systematic review and meta-analysis of controlled studies

Study, year Selection Comparability Exposure Overall stars
Is the case definition adequate? Representative of the cases Selection of controls Definition of controls Control for important factors Control for any additional factor Ascertainment of exposure Same method of ascertainment for cases and controls Nonresponse rate
Antonelli 2002 [14] - 8
Principi 2004 [17] - - - - 5
Antonelli 2004 [20] - - - - 5
Tonnelier 2003 [33] - - - 6
Rocco 2004 [34] - - - 6
  1. NOS Newcastle-Ottawa scale; the quality met the criterion of this specific item, - the item was not qualified to be awarded a star