condition mean min max ZT0-3 2.8623 2.8623 2.8623 ZT4-7 1.9369800000000001 1.9369800000000001 1.9369800000000001 ZT8-11 1.33322 1.33322 1.33322 ZT12-15 1.678175 1.678175 1.678175 ZT16-19 2.2696199999999997 2.2696199999999997 2.2696199999999997 ZT20-23 2.536766666666667 2.536766666666667 2.536766666666667