Table 1

Elements abstracted from searched studies



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

Hanioka et al. BMC Public Health 2011 11:221   doi:10.1186/1471-2458-11-221

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