condition mean min max ZT0-3 688.25 688.25 688.25 ZT4-7 716.3 716.3 716.3 ZT8-11 795.8499999999999 795.8499999999999 795.8499999999999 ZT12-15 818.65 818.65 818.65 ZT16-19 839.4000000000001 839.4000000000001 839.4000000000001 ZT20-23 657.95 657.95 657.95