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Table 2 Methodological quality assessment for the FEM studies (Newcastle-Ottawa scale)

From: Cognitive impairment in first-episode mania: a systematic review of the evidence in the acute and remission phases of the illness

Group First author (year) Selection Comparable Exposure/outcome Total stars (out of 9)
Validation of case definition or cohort exposure Representative sample Selection of controls or non-exposed cohort Definition of controls or non-exposed cohort Groups comparable in design and analysis Assessment of exposure or outcome Same method used for both groups or adequate follow-up period Non-response rate or loss to follow-up  
Acute Fleck et al. (2008) * * * ** 5
Lebowitz et al. (2001) * ** * 4
Strakowski et al. (2008) * * ** * * 6
Remission Elshahawi et al. (2011) * ** * 4
Hellvin et al. (2012) * * * * ** * 7
Lopez-Jaramillo et al. (2010) * * * ** * 6
Torres et al. (2010) * * * ** * 6
  1. *criteria was met; **criteria was met and awarded two stars (comparability only); −criteria was not met.