condition mean min max ZT0-3 2749.75 2749.75 2749.75 ZT4-7 1867.2 1867.2 1867.2 ZT8-11 1770.7 1770.7 1770.7 ZT12-15 1959.9499999999998 1959.9499999999998 1959.9499999999998 ZT16-19 2331.5 2331.5 2331.5 ZT20-23 2804.25 2804.25 2804.25