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Table 2 Methodological quality rating

From: The effect of behavioural interventions targeting hand hygiene practices among nurses in high-income hospital settings: a systematic review

Design of study  Possible points
  Experimental: randomized controlled trial (RCT), random allocation; case-controlled trial (CCT), quasi-random allocation; three data collection points before and after the intervention 1
  Quasi-experimental: controlled before-and-after study; comparable control sites 1
  Quasi-experimental: non-equivalent control sites 0
  Single group before-and-after tests with baseline measurements 0
Content  
  Intervention is clearly described 1
Sample size  
  An n per group sufficient to detect a significant effect (P < 0.05) with a power of 0.80 or reported calculation of power 1
  An n per group insufficient to detect a significant effect (P < 0.05) with a power of 0.80 or no reported calculation of power 0
Validity and reliability of instruments  
  Unobtrusive observations, procedure described 2
  Unobtrusive observations, procedure not described 1
  Obtrusive observations, procedure described 1
  Obtrusive observations, procedure not described 0
Test statistics  
  Test statistics are described 1
Significance  
  P value or confidence interval is given 1