condition mean min max ZT0-3 179.270067 179.270067 179.270067 ZT4-7 261.706899 261.706899 261.706899 ZT8-11 179.3713505 179.3713505 179.3713505 ZT12-15 236.81700999999998 236.81700999999998 236.81700999999998 ZT16-19 131.664024 131.664024 131.664024 ZT20-23 110.7765535 110.7765535 110.7765535