Table 5 Mean root caries experience (RDFS and RCI) in 35-44-year-old Greeks by location, gender, education and monthly income (first line: mean and standard deviation in parenthesis, second line: median and interquartile range in parenthesis)

Location

Rural

394

0.62

0.11

0.73 (3.20)

15.3

269

3.13 (11.6)

0.00 (0.00)

0.00 (0.00)

Urban

790

0.14

0.07

0.21 (1.10)

8.9

398

2.14 (8.30)

0.00 (0.00)

0.00 (0.00)

*Mann–Whitney U test, p < 0.001

Gender

Men

611

0.32

0.07

0.39 (2.23)

11.1

336

2.90 (10.7)

0.00 (0.00)

0.00 (0.00)

Women

573

0.28

0.10

0.38 (1.89)

11.0

331

2.30 (8.70)

0.00 (0.00)

0.00 (0.00)

*Mann–Whitney U test, NS

Education

≤ 6 years

131

0.56

0.07

0.63 (2.02)

10.7

79

3.72 (12.34)

0.00 (0.00)

0.00 (2.72)

9 years

99

0.4

0.05

0.45 (1.50)

16.2

59

2.24 (6.45)

0.00 (0.00)

0.00 (0.00)

12 years

396

0.35

0.10

0.45 (2.20)

11.1

215

3.06 (10.7)

0.00 (0.00)

0.00 (0.00)

> 12 years

539

0.13

0.07

0.20 (1.50)

8.2

304

1.79 (8.68)

0.00 (0.00)

0.00 (0.00)

*Kruskal-Wallis test, p < 0.01

Monthly income

≤ 590 €

127

0.31

0.05

0.36 (1,36)

13.4

62

1.89 (6.30)

0.00 (0.00)

0.00 (1.06)

591-1760 €

772

0.17

0.10

0.27 (1,22)

13.5

434

2.57 (10.0)

0.00 (0.00)

0.00 (0.00)

≥ 1761 €

64

0.00

0.11

0.11 (0,67)

3.1

38

0.31(1.35)

0.00 (0.00)

0.00 (0.00)

*Kruskal- Wallis test, NS

Total

1184

0.3

0.09

0.39 (2.00)

11.1

667

2.53 (10.0)

0.00 (0.00)

0.00 (0.00)