Skip to main content

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