condition mean min max ZT0-3 633.6 633.6 633.6 ZT4-7 620.1 620.1 620.1 ZT8-11 608.45 608.45 608.45 ZT12-15 544.25 544.25 544.25 ZT16-19 667.45 667.45 667.45 ZT20-23 685.1 685.1 685.1