condition mean min max ZT0-3 259.890638 259.890638 259.890638 ZT4-7 217.037677 217.037677 217.037677 ZT8-11 192.93564350000003 192.93564350000003 192.93564350000003 ZT12-15 228.33959049999999 228.33959049999999 228.33959049999999 ZT16-19 254.6959475 254.6959475 254.6959475 ZT20-23 276.23110499999996 276.23110499999996 276.23110499999996