condition mean min max ZT0-3 3.579755 3.3455 3.81401 ZT4-7 3.64041 3.64041 3.64041 ZT8-11 11.411449999999999 11.411449999999999 11.411449999999999 ZT12-15 0 0 0 ZT16-19 3.5992550000000003 3.5992550000000003 3.5992550000000003 ZT20-23 3.550815 3.550815 3.550815