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. 2021 Feb 3;10(2):226. doi: 10.3390/antiox10020226

Table 1.

Demographic characteristics of the RA group and the non-RA group at baseline for patients.

Parameters All Cases
(n = 52)
RA
(n = 26)
Non-RA
(n = 26)
Statistical Tests p
Gender
Female n (%)
Male n (%)
 
32 (61.6%)
20 (38.4%)
 
19 (73.1%)
7 (26.9%)
 
13 (50.0%)
13 (50.0%)
Chi2 test 0.090
Age (y), mean ± SD 52.60 ± 12.65
(28−78)
51.02 ± 13.56
(28−78)
54.34 ± 11.50
(34−78)
F ANOVA test 0.226
Area
Urban
Rural
 
29 (55.8%)
23 (44.2%)
 
15 (57.7%)
11 (42.3%)
 
14 (53.9%)
12 (46.1%)
Chi2 test 0.782
PD, mean ± SD 5.21 ± 0.87
(3.40−7.70)
5.40 ± 0.80
(3.40−7.30)
5.02 ± 0.91
(6.40−7.70)
F ANOVA test 0.001
No. situs 3 × 52 3 × 26 3 × 26
GI index
2
3
4
 
10 (6.4%)
84 (53.8%)
62 (39.7%)
 
5 (6.4%)
36 (46.2%)
37 (47.4%)
 
5 (6.4%)
48 (61.5%)
25 (32.1%)
Chi-square test
Likelihood Ratio
0.132
PBI index
1
2
3
4
 
1 (0.6%)
30 (19.2%)
81 (51.9%)
44 (28.2%)
 
1 (1.3%)
24 (30.8%)
35 (44.9%)
18 (23.1%)
 
0 (0.0%)
6 (7.7%)
46 (59.0%)
26 (33.3%)
Chi-square test
Likelihood Ratio
0.001
CPITN index
3
4
 
72 (46.2%)
84 (53.8%)
 
34 (43.6%)
44 (56.4%)
 
38 (48.7%)
40 (51.3%)
Chi-square test
Likelihood Ratio
0.521
Mean number of teeth left 20 ± 3 18 ± 4 22 ± 1 F ANOVA test 0.077

RA—rheumatoid arthritis + periodontal disease patients; non-RA—systemically healthy periodontal disease patients; PD—pocket probing depth; GI—gingival index; PBI—papillary bleeding index; CPITN—community periodontal index of treatment needs; p < 0.05 was considered statistically significant.