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Table 5 Details of the selected articles (n = 341) regarding the type of article and methodological parameters

From: Correction to: A bibliometric analysis of scientific production in the field of lingual orthodontics

Article type n (%) * Statistics (%)** Control group*** Sample size Articles
Interventional clinical trials 6 (1.8%) 6 (100%) 6 (100%) ≤ 20 1
>  20 5
Observational studies 70 (20.5%) 50 (71.4%) 9 (12.8%) ≤ 20 8
>  20 62
Case reports/series 58 (17.1%) 0 (0%) = 1 43
>  1 15
Laboratory studies 96 (28.1%) 0 (0%)
Systematic reviews 3 (0.9%) 3 (100%)
Narrative reviews 16 (4.7%) 2 (12.5%)
Interviews 2 (0.6%) 0 (0%)
Informative studies 40 (11.7%) 0 (0%)
Others 50 (14.7%)
  1. *number of article types and percentage of all selected articles (n = 314)
  2. **number of articles providing statistical analysis and percentage of all selected articles (n = 314)
  3. ***number of studies with control group and percentage of all selected articles (n = 314)
  4. - not applicable