| | Study ID | Year | Country | Study design | Sample size | Male (%) | Follow-up duration | Follow-up rate (%) | HbA1c levels | Study outcomes | NOS score |
| | Sato et al. [21] | 2010 | Canada | Prospective cohort | 130 | 70.8 | 30 days | 100% | <6.5% versus ≥6.5% | All-cause mortality, myocardial failure, stroke, dialysis, serious infection | 4/3/2 | | Halkos et al. [22] | 2008 | USA | Prospective cohort | 3089 | 72.6 | In-hospital stay | 100% | ≤7% versus >7% | All-cause mortality, MI, renal failure, atrial fibrillation, cerebrovascular accident | 4/2/1 | | Halkos et al. [23] | 2008 | USA | Prospective cohort | 3201 | 71.6 | 2.8 ± 1.4 years | NA | ≤7% versus >7% | Cerebrovascular disease, renal insufficiency, CHF, MI, peripheral vascular disease | 3/2/1 | | Knapik et al. [24] | 2011 | Poland | Prospective cohort | 735 | 66.3 | In-hospital stay | 100% | ≤7% versus >7% | All-cause mortality, stroke, renal failure, wound infection, perioperative MI | 4/3/2 | | Alserius et al. [25] | 2008 | Sweden | Prospective cohort | 122 | 54.9 | 3.5 years | 100% | ≤7% versus >7% | All-cause mortality, superficial sternal wound infections, mediastinitis | 4/1/2 | | Santos et al. [26] | 2015 | Argentina | Prospective cohort | 96 | 82.3 | In-hospital stay | NA | ≤7% versus >7% | All-cause mortality, CHF, MI, renal failure, stroke | 4/2/2 | | Faritous et al. [27] | 2014 | Iran | Prospective cohort | 216 | 63.9 | In-hospital stay | NA | ≤7% versus >7% | All-cause mortality, arrhythmia, AMI, CHF | 4/1/2 | | Tsuruta et al. [28] | 2011 | Japan | Prospective cohort | 306 | 79.1 | 3.6 ± 1.7 years | 100% | <6.5% versus ≥6.5% | MI, arrhythmia, congestive heart failure, sudden death | 4/3/2 |
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