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Table 2 Assessment of study quality included in the meta-analysis by Newcastle Ottawa Scale (NOS)

From: Associations between dietary patterns and the risk of breast cancer: a systematic review and meta-analysis of observational studies

Case-control studies Case definition Selection of cases Selection of controls Definition of controls Control for most important factor1 Control for any additional factor2 Ascertainment of exposure Same method of ascertainment for cases and controls Non-response rate Total scores
Mourouti et al., 2015 [70] 1 1 1 1 1 1 0 1 1 8
Castello et al., 2014 [67] 1 1 1 1 1 1 1 1 0 8
Tumas et al., 2014 [69] 1 0 1 1 1 1 1 1 1 8
Karimi et al., 2013 1 0 0 1 1 1 1 1 1 7
Bessaoud et al., 2012 [15] 1 1 1 0 1 1 1 1 0 7
Demetriou et al., 2012 [66] 1 1 1 1 1 1 1 1 0 8
Buck et al., 2011 [64] 1 0 0 0 1 1 1 1 0 5
Zhang et al., 2011 [65] 1 1 0 1 1 1 1 1 1 8
Ronco et al., 2010 [20, 63] 1 0 1 1 1 1 1 1 1 8
Cho et al., 2011 1 1 0 1 1 1 1 1 1 8
Wu et al., 2009 [12] 1 1 1 1 1 1 1 1 1 9
De Stefani et al., 2009 [61] 1 1 0 1 1 1 1 1 1 8
Murtaugh et al., 2008 [11] 1 1 1 1 1 1 1 1 0 8
Edefonti et al., 2008 [60] 1 1 0 1 1 1 1 1 1 8
Hirose et al., 2007 [59] 1 1 0 1 1 1 0 1 0 6
Cui et al., 2007 [16] 1 1 1 0 1 1 1 1 1 8
Ronco et al., 2006 [58] 1 1 0 1 1 1 0 1 1 7
Nkondjock and Ghadirian, 2005 [57] 1 1 1 0 1 1 1 1 1 8
Cohort studies Selection of exposed cohort Selection of non-exposed cohort Ascertainment of exposure Outcome was not present as baseline Control for most important factor1 Control for any additional factor2 Assessment of outcome Adequate follow-up period for outcome Adequacy of follow up of cohorts Total scores
Shin et al., 2016 [78] 1 1 0 1 1 1 1 1 0 7
Harris et al., 2016 [17] 0 1 1 1 1 1 1 1 0 7
Kojima et al., 2016 1 1 0 1 1 1 1 1 0 7
Catsburg (CSDLH), 2015 1 1 0 1 1 1 1 1 0 7
Catsburg (NBSS), 2015 1 1 0 1 1 1 1 1 0 7
Link et al., 2013 [13] 0 1 0 1 1 1 1 1 0 6
Baglietto et al., 2011 [77] 1 1 1 1 1 1 1 1 0 8
Cottet et al., 2009 [10] 1 1 0 1 1 1 1 1 1 8
Agurs-Collins et al., 2009 [76] 1 1 0 1 1 1 1 1 1 8
Velie et al., 2005 [75] 1 1 0 1 1 1 1 1 1 8
Adebamowo et al., 2005 [73] 0 1 0 1 1 1 1 1 1 7
Fung et al., 2005 [74] 0 1 1 1 1 1 1 1 1 8
Mannisto (NLCS), 2005 1 1 0 1 1 1 1 1 0 7
Mannisto (ORDET), 2005 0 1 0 1 1 1 1 1 0 6
Mannisto (SMC), 2005 1 1 0 1 1 1 1 1 0 7
Sieri et al., 2004 [72] 0 1 0 1 1 1 1 1 0 6
Terry et al., 2001 [71] 1 1 0 1 1 1 1 1 1 8
  1. 1 denote one score, 0 denote 0 score
  2. CSDLH, Canadian Study of Diet, Lifestyle and Health; NBSS, National Breast Screening Study; NLCS, Netherlands Cohort Study on Diet and Cancer; ORDET, Ormoni e Dieta nella Eziologia dei Tumori; SMC, Swedish Mammography Cohort
  3. 1The most important factors included age, BMI, energy intake. If a study adjusted for any of these three factors, it acquired one score
  4. 2Any additional factor is defined as any factor presented in Table 1 (confounding factors adjusted for in the multivariable analysis), but not including the above three most important factors. If a study adjusted for any of these additional factors, it acquired one score