condition mean min max ZT0-3 0.4337823666666667 0.10948059999999998 0.639266 ZT4-7 0.05883525 0.05883525 0.05883525 ZT8-11 0.210418 0.210418 0.210418 ZT12-15 0.55169125 0.27982999999999997 0.8235525 ZT16-19 0.28711549999999997 0.28711549999999997 0.28711549999999997 ZT20-23 0.534485 0.534485 0.534485