Table 1. Demographic characteristics and clinical periodontal parameters of study groups (mean and standard deviation).

Demographic characteristics and clinical periodontal parameters	Non-OLP gingivitis	Non-OLP chronic periodontitis	OLP gingivitis	OLP chronic periodontitis
Number of patients	13	13	9	18
Age/years	41.6±8.1a,b	51.46±6.1c,d	42.12±9.4a,b	50.15±9.1c,d
Gender (female/male)	8/5	7/6	6/3	10/9
PI	1.46±0.16a,b	2.04±0.28c,d	1.67±0.09a,b	2.21±0.14c,d
GI	1.29±0.15a,b	1.97±0.28c,d	1.50±0.11a,b	2.13±0.13c,d
PD/mm	2.12±0.07a,b	3.31±0.14c,d	2.30±0.07a,b	3.45±0.22c,d
CAL/mm	2.02±0.06a,b	3.41±0.15c,d	2.21±0.10a,b	3.56±0.21c,d

CAL, clinical attachment loss; GI, gingival index; PD, probing depth; PI, plaque index.

^aSignificantly different from non-OLP chronic periodontitis, P<0.05.

^bSignificantly different from OLP chronic periodontitis, P<0.05.

^cSignificantly different from non-OLP gingivitis, P<0.05.

^dSignificantly different from OLP gingivitis, P<0.05.