IL17A and Anxiety: When comparing changes in psychological measures with changes in biological measures, in the drumming group, there was a negative correlation between changes in IL4 and changes in anxiety across the 10 weeks, with decreases in anxiety associated with increases in IL4 (r = -.398, p = .044) and a near-significant negative correlation between changes in IL17 and changes in social resilience (r = -.381, p = .080).