condition mean min max ZT0-3 1.8094 1.6084649999999998 2.010335 ZT4-7 2.3181849999999997 2.3181849999999997 2.3181849999999997 ZT8-11 2.077985 2.077985 2.077985 ZT12-15 0 0 0 ZT16-19 5.477915 5.477915 5.477915 ZT20-23 3.607705 3.607705 3.607705