condition mean min max ZT0-3 231.539749 231.539749 231.539749 ZT4-7 141.82036 141.82036 141.82036 ZT8-11 87.3566785 87.3566785 87.3566785 ZT12-15 120.082268 120.082268 120.082268 ZT16-19 167.96519899999998 167.96519899999998 167.96519899999998 ZT20-23 245.52494249999998 245.52494249999998 245.52494249999998