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Table 4 Comparison with existing knowledge

From: Oral lichen planus clinical characteristics in Italian patients: a retrospective analysis

Study Country Patients number F:M Mean Age The 3 most affected oral sites Associated diseases Most frequent OLP clinical form Rate of malignant transformation
Salem G. (1989) [28] Saudi Arabia 4277 n.r. 49 buccal mucosa, gingiva, tongue no association atrophic- erosive 0.02 %
Bagan-Sebastian J.V. (1992) [29] Spain 205 4:1 52.6 buccal mucosa, gingiva, tongue diabetes atrophic- erosive n.r.
Gorsky M. et al. (1996) [30] Israel 157 1.5:1 52.5 buccal mucosa, gingiva, tongue no association reticular 1.3 %
Rossi L. et al. (2000) [31] Italy 100 1.32:1 58.6 buccal mucosa, gingiva, tongue C & B hepatitis, diabetes atrophic- erosive n.r.
Eisen D. et al. (2002) [32] USA 723 3:1 52 buccal mucosa, gingiva, tongue C hepatitis reticular 0.8 %
Torrente-Castell et al. (2010) [33] Spain 65 1.56:1 59 buccal mucosa, gingiva, tongue no association hyperkeratotic 3.1 %
Xue J.L. (2005) [34] China 674 1.93:1 50.4 buccal mucosa, lip, tongue no association reticular 0.6 %
Ingafou M. (2006) [35] England 690 1.75:1 52 buccal mucosa, gingiva, tongue no association reticular 1.9 %
Pakfetrat A. (2009) [36] Iran 420 1.85:1 41.6 buccal mucosa, gingiva, tongue no association reticular 0.7 %
Bermejo-Fenoll A. (2010) [37] Spain 550 3.29:1 56.4 buccal mucosa, gingiva, tongue hypertension, rheumatic diseases gastrointestinal disorders, anxiety & depression reticular and papular 0.9 %
Shen Z.Y. (2012) [38] China 518 2.13:1 46.3 buccal mucosa, gingiva, tongue no association reticular 1 %
Gümrü B. (2013) [39] Turkey 370 2.36:1 49.8 buccal mucosa, gingiva, tongue hypertension, diabetes, anxiety & depression atrophic- erosive 0.3 %
Present study Italy 87 1.8:1 58.8 buccal mucosa, gingiva, tongue hypertension, Diabetes, thyroiditis, C hepatitis hyperkeratotic 1.15 %
  1. n.r not reported