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 |