condition mean min max ZT0-3 0.871253 0.871253 0.871253 ZT4-7 1.3036855 1.3036855 1.3036855 ZT8-11 0.9227 0.9227 0.9227 ZT12-15 0.9133039999999999 0.9133039999999999 0.9133039999999999 ZT16-19 1.327361 1.327361 1.327361 ZT20-23 0.8237954999999999 0.8237954999999999 0.8237954999999999