condition mean min max ZT0-3 466.10200000000003 466.10200000000003 466.10200000000003 ZT4-7 440.9865 440.9865 440.9865 ZT8-11 385.0535 385.0535 385.0535 ZT12-15 396.13199999999995 396.13199999999995 396.13199999999995 ZT16-19 459.15366666666665 459.15366666666665 459.15366666666665 ZT20-23 617.871 617.871 617.871