Table 1 Baseline characteristics

Sex

0.50²⁾

0.48

 Male

15

12

 Female

25

28

Age (Median, QR)

40.00(32.00, 50.00)

37.50(32.00, 52.25)

0.28³⁾

0.78

Employment

0.29²⁾

0.59

 Unemployed or enrolled

 Employed

 Retired

2

35

3

1

34

5

Education level

0.05²⁾

0.82

 Less than college degree

 College degree or above

15

25

14

26

PD (Median, QR)

3.65(3.20, 3.90)

3.55(3.20, 3.90)

0.63³⁾

0.53

PD ≥ 4 mm % (mean ± SD)

40.92 ± 22.58

35.59 ± 18.18

1.16¹⁾

0.25

BOP%(Median, QR)

78.50(62.25, 88.00)

77.00(63.00, 83.75)

0.59³⁾

0.56

SESS (Median, QR )

22.00(18.00, 27.00)

20.00(17.00, 29.75)

0.76³⁾

0.45