condition mean min max ZT0-3 2265.61 2265.61 2265.61 ZT4-7 2797.36 2797.36 2797.36 ZT8-11 3238.1561110000002 3238.1561110000002 3238.1561110000002 ZT12-15 3609.25 3609.25 3609.25 ZT16-19 3002.0944446666667 3002.0944446666667 3002.0944446666667 ZT20-23 2860.938889 2860.938889 2860.938889