Table 3.

Periodontal screening Index (PSI) and associated periodontal status as number of subjects and percentage of subjects for every PSI Code (0–4) separated by evaluation group

		noDem MMSE 28–30 (n = 26)	mCI MMSE 25–27 (n = 29)	mDem MMSE 18–24 (n = 27)	modDem MMSE 10–17 (n = 29) *	sDem MMSE < 10 (n = 17) *
Periodontal status	Highest PSI	n/%	n/%	n/%	n/%	n/%
Gingivitis/calculus present	2	5/19.2	3/10.3	0/0	1/3.4	3/17.6
Moderate periodontitis	3	15/57.7	15/51.7	13/48.1	16/55.2	6/35.3
Severe periodontitis	4	6/23.1	11/37.9	14/51.9	12/41.4	8/47.1

noDem no dementia, mCI mild cognitive impairment, mDem mild dementia, modDem moderate dementia, sDem severe dementia

The PSI codes 0—healthy and 1—reversible gingivitis are not existent in all subjects (all subjects PSI 0: n = 0, PSI 1: n = 0). * examination not possible in all subjects