Country

Study

Sample size

Incidence of LN above the alveolar crest

USA

Benninger et al., 2012

28

21%

German

Holze and Wolff, 2001

68

8.8%

Iran

Behnia, 2000

669

14.06%

South Korea

Kim et al., 2004

32

0.0%

Kenya

Present study

30

0.0%