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Table 2 Summary of studies included in the main meta-analysis

From: The weekend effect: does hospital mortality differ by day of the week? A systematic review and meta-analysis

Study Year of publication No. of analyses included in meta-analysis Date of publication Database type Study sample size Measure of severity
Aldridge et al. [41] 2016 2 Post-13/10/15 Administrative Over 1,000,000 No measure of severity
Anselmi et al. [20] 2016 4 Post-13/10/15 Administrative Over 1,000,000 No measure of severity
Aylin et al. [2] 2010 1 Pre-13/10/15 Administrative Over 1,000,000 No measure of severity
Bray et al. [5] 2016 1 Post-13/10/15 Clinical registry/audit 10,000 to 100,000 Measure of severity
Brims et al. [42] 2011 1 Pre-13/10/15 Administrative Less than 10,000 Measure of severity
Button et al. [43] 2011 1 Pre-13/10/15 Administrative 10,000 to 100,000 No measure of severity
Campbell et al. [34] 2014 1 Pre-13/10/15 Clinical registry/audit 10,000 to 100,000 Measure of severity
Giannoudis et al. [39] 2016 1 Post-13/10/15 Clinical registry/audit Less than 10,000 No measure of severity
Goldacre et al. [25] 2013 1 Pre-13/10/15 Administrative 10,000 to 100,000 No measure of severity
Haddock et al. [28] 2015 1 Post-13/10/15 Administrative Less than 10,000 No measure of severity
Handel et al. [44] 2012 1 Pre-13/10/15 Administrative Over 1,000,000 No measure of severity
Jairath et al. [21] 2011 2 Pre-13/10/15 Clinical registry/audit Less than 10,000 Measure of severity
Jansen et al. [23] 2013 2 Pre-13/10/15 Administrative Less than 10,000 Measure of severity
Karthikesalingam et al. [45] 2014 1 Pre-13/10/15 Administrative 10,000 to 100,000 No measure of severity
Li et al. [29] 2016 1 Post-13/10/15 Clinical registry/audit 10,000 to 100,000 Measure of severity
Maggs et al. [46] 2010 1 Pre-13/10/15 Administrative 10,000 to 100,000 No measure of severity
McLean et al. [47] 2016 2 Post-13/10/15 Administrative 100,000 to 1,000,000 No measure of severity
Meacock et al. [24] 2017 2 Post-13/10/15 Administrative 100,000 to 1,000,000 No measure of severity
Mohammed et al. [48] 2012 2 Pre-13/10/15 Administrative Over 1,000,000 No measure of severity
Ozdemir et al. [49] 2015 1 Pre-13/10/15 Administrative Less than 10,000 No measure of severity
Ozdemir et al. [50] 2016 1 Post-13/10/15 Administrative 100,000 to 1,000,000 No measure of severity
Palmer et al. [51] 2012 1 Pre-13/10/15 Administrative 10,000 to 100,000 No measure of severity
Palmer et al. [18] 2015 1 Post-13/10/15 Administrative Over 1,000,000 No measure of severity
Patel et al. [31] 2016 1 Post-13/10/15 Administrative 10,000 to 100,000 No measure of severity
Roberts et al. [27] 2014 1 Pre-13/10/15 Administrative 10,000 to 100,000 No measure of severity
Roberts et al. [52] 2015 1 Pre-13/10/15 Administrative 10,000 to 100,000 No measure of severity
Ruiz et al. [17] 2015 2 Pre-13/10/15 Administrative 100,000 to 1,000,000 No measure of severity
Sayers et al. [35] 2017 1 Post-13/10/15 Clinical registry/audit 100,000 to 1,000,000 Measure of severity
Schmulewitz et al. [26] 2005 6 Pre-13/10/15 Administrative Less than 10,000 No measure of severity
Shiue et al. [32] 2017 1 Post-13/10/15 Administrative 100,000 to 1,000,000 No measure of severity
Smith et al. [30] 2014 1 Pre-13/10/15 Administrative 10,000 to 100,000 No measure of severity
Thomas et al. [53] 2014 1 Pre-13/10/15 Administrative Less than 10,000 Measure of severity
Turner et al. [54] 2016 1 Post-13/10/15 Administrative 10,000 to 100,000 Measure of severity
Wunsch et al. [22] 2004 2 Pre-13/10/15 Clinical registry/audit 10,000 to 100,000 Measure of severity