condition mean min max ZT0-3 2.092945 2.0878699999999997 2.09802 ZT4-7 7.28255 7.28255 7.28255 ZT8-11 10.9865 10.9865 10.9865 ZT12-15 0 0 0 ZT16-19 2.8006849999999996 2.8006849999999996 2.8006849999999996 ZT20-23 5.928765 5.928765 5.928765