. 2016 Dec 7;4:e2765. doi: 10.7717/peerj.2765

Table 2. Important socio-demographic characteristics and DMF-T of study participants by study center and study group.

Socio-demographic data of participants	Total	Study center										Study group
		1	2	3	4	5	6	7	8	9	10	MF	SF
Age (yr)
Mean	50	52	46	55	53	49	52	47	59	49	61	50	50
SD	16	15	13	17	16	13	17	16	16	15	14	15	16
Range	18–88	20–83	18–79	19–88	19–79	23–85	23–84	19–80	35–84	19–74	29–79	18–85	19–88
Total N	548	55	96	50	45	48	37	141	18	25	33	245	303
Gender (female)
N (%)	269	28 (51)	42 (42)	35 (66)	16 (36)	23 (43)	21 (48)	68 (48)	7 (37)	16 (59)	13 (37)	126 (49)	143 (46)
Total N	573	55	101	53	44	53	44	142	19	27	35	259	314
DMF-T
Mean	12.0	15.5	7.7	16.2	17.0	7.8	11.4	9.3	17.4	10.0	20.7	12.0	12.0
Total N	550	56	96	50	45	50	45	137	15	18	38	249	301
Highest education
Completed apprenticeship N (%)	241 (46)	31 (58)	40 (40)	15 (41)	22 (65)	17 (35)	15 (37)	57 (43)	13 (87)	20 (74)	11 (34)	95 (41)	146 (51)
Technical/ Vocational school N (%)	97 (19)	10 (19)	12 (12)	12 (32)	7 (21)	13 (27)	9 (22)	20 (15)	1 (7)	4 (15)	9 (28)	52 (22)	45 (16)
University/ College N (%)	92 (18)	7 (13)	33 (33)	1 (3)	0 (0)	10 (21)	12 (29)	17 (13)	1 (7)	0 (0)	11 (34)	47 (20)	45 (16)
Other N (%)	40 (8)	1 (2)	9 (9)	3 (8)	1 (3)	4 (8)	4 (10)	17 (13)	0 (0)	1 (4)	0 (0)	19 (8)	21 (7)
No N (%)	51 (10)	4 (8)	6 (6)	6 (16)	4 (12)	4 (8)	1 (2)	23 (17)	0 (0)	2 (7)	1 (3)	21 (9)	30 (11)
Total N	521	53	100	37	34	48	41	134	15	27	32	234	287

Notes.