condition mean min max ZT0-3 333.541631 333.541631 333.541631 ZT4-7 344.103069 344.103069 344.103069 ZT8-11 247.71506549999998 247.71506549999998 247.71506549999998 ZT12-15 219.77722699999998 219.77722699999998 219.77722699999998 ZT16-19 130.9910755 130.9910755 130.9910755 ZT20-23 125.54264500000001 125.54264500000001 125.54264500000001