condition mean min max ZT0-3 6697.700000000001 6697.700000000001 6697.700000000001 ZT4-7 5943.6 5943.6 5943.6 ZT8-11 5947.0 5947.0 5947.0 ZT12-15 6575.9 6575.9 6575.9 ZT16-19 6720.55 6720.55 6720.55 ZT20-23 7257.75 7257.75 7257.75