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Table 1 Comparison socio-demographic exposure variables between cases and controls

From: Risk factors for chronic periodontitis in Sri Lankan adults: a population based case–control study

Variable Cases (694) Controls (706) p value
n % n %
Sex
 Female 261 37.6 419 59.3  <0.001
 Male 433 62.4 287 40.7  
Age group (years)
 30–44 298 42.9 374 53.0  <0.001
 45–60 396 57.1 332 47.0  
Ethnicity
 Sinhala 545 82.4 581 79.2 0.033
 Tamil 75 11.5 81 10.9  
 Muslim 68 6.1 43 9.9  
Level of education (years)
 0–5 86 12.4 50 7.1  <0.001
 6–10 277 39.9 197 27.9  
 11–12 299 43.1 401 56.8  
 >12 32 4.6 58 8.2  
Monthly household income (Rupees)
 ≤20,000 494 71.2 512 72.5 0.57
 >20,000 200 28.8 194 27.5  
Current occupationa
 Low category 568 81.8 526 74.5 0.001
 High category 126 18.2 180 25.5  
  1. For all variables but ethnicity, the total number of cases and controls were 694 and 706 respectively. With regards to ethnicity, seven participants who belonged to minor races were excluded in the analysis; cases = 688 and control = 705)
  2. aLow = unskilled/skilled larbourer, unemployed for males, housewife, lower business; high = professional, managerial, clerical, technical, upper business