condition mean min max ZT0-3 30.2315 11.7288 48.7342 ZT4-7 91.3817 91.3817 91.3817 ZT8-11 55.284000000000006 55.284000000000006 55.284000000000006 ZT12-15 0 0 0 ZT16-19 82.5824 82.5824 82.5824 ZT20-23 51.8557 51.8557 51.8557