Table 1.

Principal characteristics of the groups.

	Total	Healthy	Gingivitis	Periodontitis
Subjects	146	46	34	66
Males	63	12	14	37
Females	83	34	20	29
Age (means years ± SD)	39.8±18.9	31.6±18.6	34.3±15.4	48.9±18.2
Sampling depht (mm±SD)	3.9±1.7	2.6±0.6	3.2±1.0	5.0±1.7