condition mean min max ZT0-3 984.3499999999999 984.3499999999999 984.3499999999999 ZT4-7 922.6 922.6 922.6 ZT8-11 818.3499999999999 818.3499999999999 818.3499999999999 ZT12-15 840.15 840.15 840.15 ZT16-19 1074.35 1074.35 1074.35 ZT20-23 1188.4 1188.4 1188.4