condition mean min max ZT0-3 807.3 807.3 807.3 ZT4-7 619.6 619.6 619.6 ZT8-11 496.34999999999997 496.34999999999997 496.34999999999997 ZT12-15 571.7 571.7 571.7 ZT16-19 661.95 661.95 661.95 ZT20-23 733.8499999999999 733.8499999999999 733.8499999999999