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Table 6 Meta-regression analysis for difference in HbA1c between smokers and non-smokers

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 10 0.02 (0.01, 0.02) <0.001
Study age criteria (under 22 or over 18) 10 0.36 (−0.16, 0.89) 0.016
Type I or Type II diabetes 9 0.43 (−0.07, 0.93) 0.080
Male (percent) 10 0.01 (−0.00, 0.02) 0.101
Study design 10 −0.33 (−1.31, 0.65) 0.461
Duration smoked 4 0.021 (0.004, 0.038) 0.034
  1. The italics values were to indicate statistical significance. A value of <0.05 was statitically significant