condition mean min max ZT0-3 3.4297649999999997 3.22171 3.6378199999999996 ZT4-7 0.6893360000000001 0.6893360000000001 0.6893360000000001 ZT8-11 0.151981 0.151981 0.151981 ZT12-15 0 0 0 ZT16-19 1.6397750000000002 1.6397750000000002 1.6397750000000002 ZT20-23 1.49893 1.49893 1.49893