condition mean min max ZT0-3 124.987725 124.987725 124.987725 ZT4-7 172.8474415 172.8474415 172.8474415 ZT8-11 223.20083699999998 223.20083699999998 223.20083699999998 ZT12-15 206.548697 206.548697 206.548697 ZT16-19 203.90098799999998 203.90098799999998 203.90098799999998 ZT20-23 174.6551335 174.6551335 174.6551335