condition mean min max ZT0-3 2.2870049999999997 1.82773 2.7462799999999996 ZT4-7 1.9835699999999998 1.9835699999999998 1.9835699999999998 ZT8-11 2.7575849999999997 2.7575849999999997 2.7575849999999997 ZT12-15 0 0 0 ZT16-19 2.647755 2.647755 2.647755 ZT20-23 2.2751400000000004 2.2751400000000004 2.2751400000000004