condition mean min max ZT0-3 586.232057 586.232057 586.232057 ZT4-7 487.039256 487.039256 487.039256 ZT8-11 546.559297 546.559297 546.559297 ZT12-15 619.4028035 619.4028035 619.4028035 ZT16-19 563.5670595 563.5670595 563.5670595 ZT20-23 345.808247 345.808247 345.808247