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Table 1 Sample characteristics of study population

From: Antibodies against citrullinated proteins in relation to periodontitis with or without rheumatoid arthritis: a cross-sectional study

Group/Characteristics RAPd RA Pd HC p-value
(n = 20) (n = 20) (n = 20) (n = 20)  
Mean age (years) 54.3 ± 7.5 52.7 ± 9.5 44.0 ± 11.6 39.6 ± 11.5 ** < 0.00a
Mean ESR (mm/hr) 32.8 ± 21.4 27.9 ± 11.6 N/A N/A 0.379b
  n (%) n (%) n (%) n (%)  
Gender      
Female 14 (70) 19 (95) 11 (55) 16 (80) **0.028c
Male 6 (30) 1 (5) 9 (45) 4 (20)
Ethnicity      
Malay 4 (20) 7 (35) 9 (45) 13 (65) 0.086c
Chinese 11 (55) 7 (35) 9 (45) 5 (25)
Indian 5 (25) 6 (30) 2 (10) 2 (10)
Educational level      
Tertiary 6 (30) 13 (65) 13 (65) 18 (90) 0.050c
Secondary 14 (70) 6 (30) 7 (35) 2 (10)
Primary 0 (0) 1 (5) 0 (0) 0 (0)
Smoking status      
Smoker 2 (10) 0 (0) 3 (15) 3 (15) 0.457c
Former smoker 2 (10) 0 (0) 1 (5) 1 (5)
Non-smoker 16 (80) 20 (100) 16 (80) 16 (80)
RA disease duration      
 < 5 8 (40) 7 (35) N/A N/A 0.587c
5–10 6 (30) 9 (45) N/A N/A
 > 10 years 6 (30) 4 (20) N/A N/A
RA medication
Corticosteroid
NSAIDs
Conventional DMARDs
Biologic DMARDs
Combination
1(5)
3(15)
7(35)
0(0)
6(30)
0(0)
2(10)
9(40)
1(5)
5(25)
N/A
N/A
N/A
N/A
N./A
N/A
N/A
N/A
N/A
N/A
0.632c
PD status      
Localised Pd 17 (85) N/A 14 (70) N/A 0.110c
Generalised Pd 3 (15) N/A 6 (30) N/A
  1. RA, Rheumatoid arthritis; Pd, Periodontitis; RAPd group, Subjects with RA and Pd; RA group, Subjects with RA but without Pd; Pd group, Subjects without RA but has Pd; HC group, Subjects without both RA and Pd; ESR, Erythrocyte sedimentation rate; NSAIDs, Non-steroidal anti-inflammatory drugs; DMARDs, Disease modifying antirheumatic drugs
  2. aOne-way ANOVA
  3. bIndependent sample T-test
  4. cPearson Chi-square test
  5. **Statistically significant at p < 0.05