condition mean min max ZT0-3 66.475798 66.475798 66.475798 ZT4-7 55.539997 55.539997 55.539997 ZT8-11 70.1506465 70.1506465 70.1506465 ZT12-15 134.484957 134.484957 134.484957 ZT16-19 79.72865250000001 79.72865250000001 79.72865250000001 ZT20-23 111.919887 111.919887 111.919887