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Table 2 Quality assessment scores of included studies

From: Maximising response to postal questionnaires – A systematic review of randomised trials in health research

Author Random-isation performed? Allocation concealed? Similar baseline characteristics? Eligibility criteria specified? Blind outcome assessment? Adequate reporting of results? ITT analysis? No performance bias? Quality score
Dorman 1997 ? ? ? A
Dunn 2003 ? X A
Evans 2004 ? ? X ? B
Iglesias 2000 X A
Jenkinson 2003 ? ? ? X ? D
Jones a,b 2000 ? ? X ? X ? D
Leigh Brown 1997 ? ? ? ? B
McColl a,b 2003 ? X A
Parkes 2000 ? ? ? ? B
Salim Silva 2002 ? ? X ? B
Sutherland 1996 ? ? X ? B
Tai 1997 ? X ? ? B
Ward 1996 ? ? X ? X ? D
  1. To score:
  2. 5 or more √ = Good: A
  3. 2–4 √ = Moderate: B
  4. 4 or more X = Poor: C
  5. 4 or more ? = Unclear: D