Table 4 Annual tooth loss per patient during SPT with or without tooth loss during APT.

		Patients who did not lose any teeth during APT			Patients who lost a tooth during APT
			Annual tooth loss per patient during SPT			Annual tooth loss per patient during SPT
	Number of patients	Number of patients	Mean ± SD	Median (25% quantile;75% quantile)	Number of patients	Mean ± SD	Median (25% quantile;75% quantile)	p-value
Stage
I	19	19	0.00 ± 0.00	0.00 (0.00;0.00)	0
II	137	137	0.00 ± 0.00	0.00 (0.00;0.00)	0
III	335	319	0.04 ± 0.14	0.00 (0.00;0.00)	16	0.05 ± 0.08	0.00 (0.00;0.11)	0.30
IV	116	90	0.17 ± 0.25	0.00 (0.00;0.31)	26	0.18 ± 0.32	0.00 (0.00;0.26)	0.70
Grade
A	9	9	0.00 ± 0.00	0.00 (0.00;0.00)	0
B	334	329	0.00 ± 0.03	0.00 (0.00;0.00)	5	0.05 ± 0.11	0.00 (0.00;0.00)	0.46
C	264	227	0.13 ± 0.23	0.00 (0.00;0.16)	37	0.14 ± 0.28	0.00 (0.00;0.17)	0.11
Stage I Grade A	2	2	0.00 ± 0.00	0.00 (0.00;0.00)	0
Stage I Grade B	17	17	0.00 ± 0.00	0.00 (0.00;0.00)	0
Stage II Grade A	7	7	0.00 ± 0.00	0.00 (0.00;0.00)	0
Stage II Grade B	128	128	0.00 ± 0.00	0.00 (0.00;0.00)	0
Stage II Grade C	2	2	0.00 ± 0.00	0.00 (0.00;0.00)	0
Stage III Grade B	159	155	0.00 ± 0.02	0.00 (0.00;0.00)	4	0.06 ± 0.12	0.00 (0.00;0.06)	0.06
Stage III Grade C	176	164	0.08 ± 0.19	0.00 (0.00;0.08)	12	0.05 ± 0.07	0.00 (0.00;0.10)	0.76
Stage IV Grade B	30	29	0.03 ± 0.07	0.00 (0.00;0.00)	1	0.00 ± 0.00	0.00 (0.00;0.00)	0.77
Stage IV Grade C	86	61	0.24 ± 0.27	0.00 (0.00;0.38)	25	0.19 ± 0.32	0.00 (0.00;0.26)	0.19
Total	607	565	0.05 ± 0.16	0.00 (0.00;0.00)	42	0.13 ± 0.26	0.00 (0.00;0.16)

Statistical analysis was performed with the Mann–Whitney U test. Tooth loss per patient is shown as mean ± standard deviation. APT active periodontal therapy; SPT supportive periodontal therapy.

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