Table 1 Demographics by group assignment

Mean age (SD)

42.4 (15.85)

43.3 (15.16)

44.2 (12.30)

43.4 (13.41)

41.1 (13.76)

42.9 (14.08)

0.840^a

Sex, n (%)

    Male

11 (20.4%)

7 (13.0%)

16 (29.6%)

13 (24.1%)

16 (29.6%)

63 (23.3%)

0.205^b

    Female

43 (79.6%)

47 (87.0%)

38 (70.4%)

41 (75.9%)

38 (70.4%)

207 (76.7%)

Race, n (%)

    White

48 (88.9%)

47 (87.0%)

50 (92.6%)

47 (87.0%)

47 (87.0%)

239 (88.5%)

0.839^c

    Black/African American

5 (9.3%)

7 (13.0%)

4 (7.4%)

7 (13.0%)

7 (13.0%)

30 (11.1%)

    Asian

1 (1.9%)

0

0

0

0

1 (< 1.0%)

Ethnicity, n (%)

    Hispanic/Latino

3 (5.6%)

2 (3.7%)

1 (1.9%)

1 (1.9%)

4 (7.4%)

11 (4.1%)

0.646^c

    Not Hispanic/Latino

51 (94.4%)

52 (96.3%)

53 (98.1%)

53 (98.1%)

50 (92.6%)

259 (95.9%)

Smoker, n (%)

    No

53 (98.1%)

52(96.3%)

54 (100%)

54 (100%)

51 (94.4%)

264 (97.8%)

0.317^c

    Yes

1 (1.9%)

2 (3.7%)

0

0

3 (5.6%)

6 (2.2%)

Baseline scores (whole mouth)

    Mean MGI (SD)

2.57 (0.310)

2.57 (0.319)

2.66 (0.287)

2.59 (0.281)

2.64 (0.263)

2.60 (0.293)

0.336^a

    Mean TPI (SD)

3.08 (0.413)

3.00 (0.463)

3.03 (0.393)

3.13 (0.441)

3.04 (0.438)

3.06 (0.430)

0.560^a

    Mean EBI (SD)

0.324 (0.2229)

0.312 (0.1761)

0.360 (0.1930)

0.346 (0.1740)

0.325 (0.1969)

0.334 (0.1927)

0.706^a

    Mean Bleeding Upon Probing Pocket Depth (SD)

0.110 (0.1535)

0.099 (0.1145)

0.138 (0.1824)

0.089 (0.1112)

0.111 (0.1298)

0.109 (0.1408)

0.444^a

    Mean Pocket Depth (SD)

2.07 (0.341)

2.00 (0.332)

2.13 (0.395)

2.06 (0.310)

2.08 (0.370)

2.07 (0.351)

0.442^a

Baseline Scores (interproximal)

    Mean MGI (SD)

2.74 (0.269)

2.73 (0.285)

2.80 (0.224)

2.75 (0.233)

2.79 (0.207)

2.76 (0.245)

0.432^a

    Mean TPI (SD)

3.21 (0.390)

3.15 (0.409)

3.17 (0.358)

3.27 (0.400)

3.19 (0.393)

3.20 (0.390)

0.516^a

    Mean EBI (SD)

0.323 (0.2308)

0.304 (0.1846)

0.360 (0.2049)

0.344 (0.1750)

0.318 (0.1970)

0.330 (0.1989)

0.610^a

    Mean Bleeding Upon Probing Pocket Depth (SD)

0.121 (0.1745)

0.106 (0.1248)

0.151 (0.1973)

0.100 (0.1233)

0.118 (0.1408)

0.119 (0.1547)

0.490^a

    Mean Pocket Depth (SD)

2.33 (0.347)

2.24 (0.346)

2.39 (0.403)

2.30 (0.316)

2.32 (0.376)

2.32 (0.359)

0.299^a