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. 2018 Nov 26;13(11):e0200900. doi: 10.1371/journal.pone.0200900

Table 1. Characteristics of periodontally healthy controls and chronic periodontitis patients.

Characteristics Healthy
(n = 64)
Chronic periodontitis Total
(n = 170)
Early
(n = 32)
Moderate
(n = 39)
Severe
(n = 35)
Sex
Male 39 (60.9%) 15 (46.9%) 19 (48.7%) 21 (60.0%) 94 (55.3%)
Female 25 (39.1%) 17 (53.1%) 20 (51.3%) 14 (40.0%) 76 (44.7%)
Age group (years)
20–29 34 (53.1%) 2 (6.3%) 1 (2.6%) 0 (0%) 37 (21.8%)
30–39 18 (28.1%) 10 (31.3%) 2 (5.1%) 0 (0%) 30 (17.6%)
40–49 3 (4.7%) 4 (12.5%) 8 (20.5%) 9 (25.7%) 24 (14.1%)
50–59 4 (6.3%) 11 (34.4%) 16 (41.0%) 23 (65.7%) 54 (31.8%)
≥ 60 5 (7.8%) 5 (15.6%) 12 (30.8%) 3 (8.6%) 25 (14.7%)
Clinical attachment level (mm)
<3.0 63 (98.4%) 28 (87.5%) 14 (35.9%) 5 (14.3%) 110 (64.7%)
≥3.0 1 (1.6%) 4 (12.5%) 25 (64.1%) 30 (85.7%) 60 (35.3%)
Pocket depth (mm)
<3.0 64 (100%) 31 (96.9%) 20 (51.3%) 6 (17.1%) 121 (71.2%)
≥3.0 0 (0%) 1 (3.1%) 19 (48.7%) 29 (82.9%) 49 (28.8%)
Plaque index
<25 52 (81.3%) 16 (50.0%) 21 (53.8%) 13 (37.1%) 102 (60.0%)
25–49 11 (17.2%) 13 (40.6%) 11 (28.2%) 16 (45.7%) 51 (30.0%)
≥50 1 (1.6%) 3 (9.4%) 7 (17.9%) 6 (17.1%) 17 (10.0%)
Number of teeth*
≤27 15 (23.4%) 12 (37.5%) 23 (59.0%) 22 (62.9%) 72 (42.4%)
>27 49 (76.6%) 20 (62.5%) 16 (41.0%) 13 (37.1%) 98 (57.6%)
Smoking history
Never 51 (79.7%) 24 (75.0%) 25 (64.1%) 17 (48.6%) 117 (68.8%)
Former 10 (15.6%) 6 (18.8%) 8 (20.5%) 9 (25.7%) 33 (19.4%)
Daily 3 (4.7%) 2 (6.3%) 6 (15.4%) 9 (25.7%) 20 (11.8%)
Oral care (dental floss, mouthwash)
Yes 54 (84.4%) 25 (78.1%) 23 (59.0%) 19 (54.3%) 121 (71.2%)
No 10 (15.6%) 7 (21.9%) 16 (41.0%) 16 (45.7%) 49 (28.8%)
Scaling (within 6 months)
Yes 44 (68.75%) 10 (31.3%) 8 (20.5%) 6 (17.1%) 68 (40.0%)
No 20 (31.25%) 22 (68.8%) 31 (79.5%) 29 (82.9%) 102 (60.0%)
Gargling frequency
≥3 54 (84.4%) 22 (68.8%) 12 (30.8%) 15 (42.9%) 103 (60.6%)
≤2 10 (15.6%) 10 (31.3%) 27 (69.2%) 20 (57.1%) 67 (39.4%)
Insomnia
No 51 (79.7%) 23 (71.9%) 27 (69.2%) 20 (57.1%) 121 (71.2%)
Sometimes 13 (20.3%) 7 (21.9%) 9 (23.1%) 11 (31.4%) 40 (23.5%)
Always 0 (0%) 2 (6.3%) 3 (7.7%) 4 (11.4%) 9 (5.3%)

*The mean number of teeth present in all subjects was 27.