condition mean min max ZT0-3 403.017891 403.017891 403.017891 ZT4-7 415.70498150000003 415.70498150000003 415.70498150000003 ZT8-11 484.38604999999995 484.38604999999995 484.38604999999995 ZT12-15 508.929132 508.929132 508.929132 ZT16-19 395.234327 395.234327 395.234327 ZT20-23 328.103294 328.103294 328.103294