IL31 and osteoporosis: Stratifying patients according to BMD values, no statistically significant differences were found between IL-31 levels in those affected by mild (T-score > -3) compared to severe (T-score < -3) osteoporosis (59.17 ± 9.22 pg/ml vs 37.91 ± 10.52 pg/ml respectively; p = 0.876), as well as between patients with mild osteoporosis and controls (p = 0.13) and between patients with severe osteoporosis and controls (p = 0.059).