condition mean min max ZT0-3 1668.681118 1668.681118 1668.681118 ZT4-7 1642.9462509999998 1642.9462509999998 1642.9462509999998 ZT8-11 1343.757925 1343.757925 1343.757925 ZT12-15 1659.8786995 1659.8786995 1659.8786995 ZT16-19 1517.6599845 1517.6599845 1517.6599845 ZT20-23 2003.4042075000002 2003.4042075000002 2003.4042075000002