condition mean min max ZT0-3 53.51285 53.51285 53.51285 ZT4-7 54.74525 54.74525 54.74525 ZT8-11 36.706649999999996 36.706649999999996 36.706649999999996 ZT12-15 48.01235 48.01235 48.01235 ZT16-19 53.36065 53.36065 53.36065 ZT20-23 47.8154 47.8154 47.8154