condition mean min max ZT0-3 18.54895 16.82175 20.4253 ZT4-7 14.757249999999999 14.757249999999999 14.757249999999999 ZT8-11 21.9617 21.9617 21.9617 ZT12-15 36.698225 35.2924 38.10405 ZT16-19 35.5499 35.5499 35.5499 ZT20-23 24.101399999999998 24.101399999999998 24.101399999999998