condition mean min max ZT0-3 4.234305000000001 3.13093 5.337680000000001 ZT4-7 3.6025600000000004 3.6025600000000004 3.6025600000000004 ZT8-11 3.88959 3.88959 3.88959 ZT12-15 0 0 0 ZT16-19 4.852835000000001 4.852835000000001 4.852835000000001 ZT20-23 4.225985 4.225985 4.225985