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Table 2 Methodological characteristics of studies.

From: Systematic review and meta-analysis: influence of smoking cessation on incidence of pneumonia in HIV

Author (year) Study design Exposure assessment Outcome assessment Number of confounders controlled Study quality score
   Definition of smoking Definition of non smoking Method of assessingsmoking status Definition ofpneumonia Blinding ofassessors toexposure status (cohort studies)   
Bacterial pneumonia
[12] Case control >1 cig/day Never smoked Medical history 2 0 3 7
[21] Cohort NR Former and never, otherwise undefined Questionnaire or clinical notes 1 0 4 5
[13] Nested case-control NR NR NR 2 1 0 3
[23] Cohort NR NR Interview 2 1 4 7
[14] Cohort NR Never smokers <100 cigarettes in lifetime NR 2 0 4 6
[15] Cohort NR Not current smokers NR 2 0 7 9
[16] Cohort NR NR Questionnaire 2 0 4 6
[17] Cohort NR NR Questionnaire 2 0 0 2
[18] Case control >6 cigs/day NR NR 2 0 0 3
Bacterial pneumonia and Pneumocystis jiroveci pneumonia
[19] Cohort NR Self-defined Clinical notes 0 0 4 4
[20] Cohort Cigarettes/day in multiple categories NR Questionnaire 1 0 0 2
[25] Case control NR NR Questionnaire 2 0 3 5
Pneumocystis jiroveci pneumonia only
[22] Cohort Defined according to daily cigarette consumption and change in smoking status over time Not currently smoking Questionnaire 2 0 2 6
[24] Case control Current tobacco use Current non-smoking Questionnaire and clinical notes 2 0 1 4
  1. NR: not reported.