condition mean min max ZT0-3 383.7 383.7 383.7 ZT4-7 900.5 900.5 900.5 ZT8-11 1384.0 1384.0 1384.0 ZT12-15 2157.45 2157.45 2157.45 ZT16-19 1624.9499999999998 1624.9499999999998 1624.9499999999998 ZT20-23 655.8 655.8 655.8