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Table 2 Quality assessment of studies

From: Primary health care-level interventions targeting health literacy and their effect on weight loss: a systematic review

Study (Year) Selection bias Allocation bias Confounders Blinding Data collection methods Withdrawals and dropouts Category of quality
Randomised controlled trials
Barclay (2008) [21] Strong Strong Strong Strong Strong Strong Strong
Bo (2007) [23] Strong Strong Strong Strong Strong Strong Strong
Greaves (2008) [25] Strong Strong Strong Strong Strong Moderate Strong
Kulzer (2009) [26] Weak Strong Strong Weak Strong Strong Weak
McConnon (2007) [28] Weak Strong Strong Weak Strong Weak Weak
Tsai (2010) [30] Weak Strong Weak Weak Strong Strong Weak
Whittemore (2009) [31] Moderate Strong Strong Strong Strong Strong Strong
Non-Equivalent Groups Design trials/ Single group pre-post trials
Absetz (2007) [19] Moderate Weak Strong Weak Strong Strong Weak
Arrebola (2011) [20] Weak Weak Strong Weak Strong Weak Weak
Bjorkelund (1991) [22] Moderate Weak Weak Weak Strong Strong Weak
Gilis-Januszewska (2011) [24] Weak Weak Weak Weak Strong Moderate Weak
Laatikainen (2007) [27] Moderate Weak Strong Weak Strong Moderate Weak
Rohrer (2008) [29] Moderate Weak Strong Weak Strong Strong Weak
  1. Rating on study quality.
  2. Strong: No weak and at least 4 strong ratings.
  3. Moderate: 1 weak and <4 strong ratings.
  4. Weak: ≥2 weak ratings.