condition mean min max ZT0-3 3.1148625 2.76966 3.460065 ZT4-7 1.655135 1.655135 1.655135 ZT8-11 2.959615 2.959615 2.959615 ZT12-15 0 0 0 ZT16-19 3.81212 3.81212 3.81212 ZT20-23 4.74661 4.74661 4.74661