condition mean min max ZT0-3 415.43958 415.43958 415.43958 ZT4-7 599.678453 599.678453 599.678453 ZT8-11 681.234866 681.234866 681.234866 ZT12-15 695.630401 695.630401 695.630401 ZT16-19 577.987282 577.987282 577.987282 ZT20-23 563.02541 563.02541 563.02541