Table 1.

Patient characteristics by age group (BOP, bleeding on probing; PD, pocket probing depth).

	Total	<30 Years	30–39 Years	40–49 Years	>50	p-Value
Number of patients	977	193	441	196	147
Sex						0.356
Male	324	65	149	64	46
Female	653	128	292	132	101
Smoking status						0.179
Current smoker	162	41	73	29	19
Non-smoker	815	152	368	167	128
Number of teeth	26.7 ± 2.3	27.6 ± 1.0	27.2 ± 1.4	26.2 ± 2.3	24.5 ± 4.0	<0.001
Bone crest level (mm)	2.1 ± 1.2	1.6 ± 0.7	1.9 ± 0.9	2.4 ± 1.3	3.1 ± 1.4	<0.001
BOP (%)	24.3 ± 21.8	20.2 ± 21.0	22.9 ± 20.7	26.2 ± 23.2	31.3 ± 22.7	<0.001
Site with PD ≥4 mm (%)	15.2 ± 16.7	8.7 ± 12.1	13.4 ± 15.0	17.7 ± 18.4	25.9 ± 18.9	<0.001