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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