condition mean min max ZT0-3 23.4063 20.75385 26.05875 ZT4-7 31.8525 31.8525 31.8525 ZT8-11 49.57275 49.57275 49.57275 ZT12-15 0 0 0 ZT16-19 43.403949999999995 43.403949999999995 43.403949999999995 ZT20-23 40.6635 40.6635 40.6635