condition mean min max ZT0-3 643.6 643.6 643.6 ZT4-7 314.9 314.9 314.9 ZT8-11 491.4 491.4 491.4 ZT12-15 510.65 510.65 510.65 ZT16-19 619.05 619.05 619.05 ZT20-23 435.9 435.9 435.9