condition mean min max ZT0-3 1.52645 1.52645 1.52645 ZT4-7 1.156045 1.156045 1.156045 ZT8-11 1.3278500000000002 1.3278500000000002 1.3278500000000002 ZT12-15 1.175195 1.175195 1.175195 ZT16-19 1.4653100000000001 1.4653100000000001 1.4653100000000001 ZT20-23 1.235975 1.235975 1.235975