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Table 11 Meta-regression analysis for difference in HbA1c between current and quitters

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

Covariate N studies Coefficient (95% CI) p value
Mean study age 4 0.01 (−0.02, 0.03) 0.432
Study age criteria (under 22 or over 18) 4 0.36 (−1.06, 1.79) 0.391
Type I or type II diabetes 4 0.21 (−1.46, 1.89) 0.640
Male (percent) 4 0.001 (−0.035, 0.037) 0.909
Study design 4 0.40 (0.13, 0.66) 0.022
Duration smoked 3 0.003 (−0.063, 0.070) 0.628
  1. The italics values were to indicate statistical significance. A value of <0.05 was statitically significant