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Table 1 Elements abstracted from searched studies

From: Causal assessment of smoking and tooth loss: A systematic review of observational studies

Study Elements
All studies Citation and publication status
  Study design: cross sectional or cohort study
  Participants: number, sex, age range, country, residency and representativeness
  Focal factor(s) with respect to the association with tooth loss: smoking only or various factors including smoking
  Factors entered in the final analytical model
  Type of the estimate of association, effect size and confidence interval
  Category of evaluated group: age group, sex and type of exposure
  Statistical significance of the dose-response relationship
  Special mention: sensitivity, subgroup and other types of analyses and the source of funding
Cross sectional studies Definition and prevalence of tooth loss
Cohort studies Observational length and non-respondent and follow-up rates