Linkage disequilibrium between the IL1RN and the IL1B polymorphisms
| IL1RN allele | IL1B allele | D′3-150 | χ2 | p value |
| A1 | C | 0.31 | 95.8 | <0.0001 |
| A2 | T | 0.36 | 111.2 | <0.0001 |
| A3 | C | 0.44 | 2.7 | 0.10 |
↵3-150 D′ is a measure of the extent of linkage disequilibrium, expressed as a percentage of its maximal value given the allele frequencies in the population (D′=D/Dmax).34