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Table 2 Study characteristics of smokers and quitters

From: Relationship of cardiometabolic parameters in non-smokers, current smokers, and quitters in diabetes: a systematic review and meta-analysis

Study Country No of participants Exposure/control Age/sex Included or excluded from meta-analysis
Study design
Smoker Quitter Smoker Quitter
Lycett et al. [51] T2DM UK 10,692 7561 3131 61.6 (12.1)
58.4% M
61.6 (11.3)
64.4% M
Included
Retrospective cohort study
Iino et al. [52] T2DM Japan 31 16 15 60.1 (2.5)
81.25% M
62.7 (2.5)
80% M
Excluded (subjects started smoking within 12 months)
Prospective cohort study
Reynolds et al. [42] T2DM USA 125 66 59 18.6 (2.5)
39.4%
17.9 (2.4)
47.5% M
Included
Cross sectional study
Reynolds et al. [42] T1DM USA 412 203 209 18.3 (2.2)
50.7% M
17.7 (2.7)
47.4% M
Included
Cross sectional study
Ohkuma et al. [50] T2DM Japan 2490 679 1306 61.2 (10) 66.9 (9.2) Included
Cross sectional study