condition mean min max ZT0-3 711.3 711.3 711.3 ZT4-7 992.5 992.5 992.5 ZT8-11 1177.05 1177.05 1177.05 ZT12-15 1509.75 1509.75 1509.75 ZT16-19 1471.9499999999998 1471.9499999999998 1471.9499999999998 ZT20-23 985.5 985.5 985.5