1. The Effect of Smoking on the Risk of Sciatica: A Meta-analysis
Rahman Shiri, MD, PhD, Kobra Falah-Hassani, PhD 
The American Journal of Medicine 
Volume 129, Issue 1, Pages e20 (January 2016)
DOI: /j.amjmed
Copyright © 2016 Elsevier Inc. Terms and Conditions

2. Figure 1
A meta-analysis of 9 studies on the effect of smoking on lumbar radicular pain. CI = confidence interval; OR = odds ratio.
The American Journal of Medicine  , e20DOI: ( /j.amjmed )
Copyright © 2016 Elsevier Inc. Terms and Conditions

3. Figure 2
A meta-analysis of 8 studies on the effect of smoking on clinically verified sciatica. CI = confidence interval; OR = odds ratio.
The American Journal of Medicine  , e20DOI: ( /j.amjmed )
Copyright © 2016 Elsevier Inc. Terms and Conditions

4. Figure 3
A meta-analysis of 11 studies on the effect of smoking on hospitalization or surgery due to a herniated lumbar disc or clinically verified sciatica. CI = confidence interval; OR = odds ratio.
The American Journal of Medicine  , e20DOI: ( /j.amjmed )
Copyright © 2016 Elsevier Inc. Terms and Conditions

5. Figure 4
A meta-analysis of 13 studies on the effect of smoking on lumbar radicular pain or clinically verified sciatica among men. CI = confidence interval; OR = odds ratio.
The American Journal of Medicine  , e20DOI: ( /j.amjmed )
Copyright © 2016 Elsevier Inc. Terms and Conditions

6. Figure 5
A meta-analysis of 10 studies on the effect of smoking on lumbar radicular pain or clinically verified sciatica among women. CI = confidence interval; OR = odds ratio.
The American Journal of Medicine  , e20DOI: ( /j.amjmed )
Copyright © 2016 Elsevier Inc. Terms and Conditions

7. Supplementary Figure 1
Flow chart of the search strategy and selection of studies.
The American Journal of Medicine  , e20DOI: ( /j.amjmed )
Copyright © 2016 Elsevier Inc. Terms and Conditions

8. Supplementary Figure 2
A funnel plot of 28 studies on the association between current smoking (20 studies) or ever smoking (8 studies), and lumber radicular pain or clinically verified sciatica. P-value for Egger test = .56.
The American Journal of Medicine  , e20DOI: ( /j.amjmed )
Copyright © 2016 Elsevier Inc. Terms and Conditions