condition mean min max ZT0-3 4.0580075 3.77332 4.342695 ZT4-7 4.245905 4.245905 4.245905 ZT8-11 1.716135 1.716135 1.716135 ZT12-15 0 0 0 ZT16-19 1.7204350000000002 1.7204350000000002 1.7204350000000002 ZT20-23 2.235985 2.235985 2.235985