condition mean min max ZT0-3 18.5282 18.5282 18.5282 ZT4-7 21.6961 21.6961 21.6961 ZT8-11 24.31395 24.31395 24.31395 ZT12-15 17.42875 17.42875 17.42875 ZT16-19 22.41455 22.41455 22.41455 ZT20-23 17.131050000000002 17.131050000000002 17.131050000000002