condition mean min max ZT0-3 58.600516666666664 49.731849999999994 65.6089 ZT4-7 28.259549999999997 28.259549999999997 28.259549999999997 ZT8-11 10.81995 10.81995 10.81995 ZT12-15 19.90385 15.96115 23.84655 ZT16-19 20.1578 20.1578 20.1578 ZT20-23 38.7057 38.7057 38.7057