condition mean min max ZT0-3 30.580225000000002 30.252050000000004 30.9084 ZT4-7 23.20315 23.20315 23.20315 ZT8-11 19.6819 19.6819 19.6819 ZT12-15 0 0 0 ZT16-19 19.918149999999997 19.918149999999997 19.918149999999997 ZT20-23 17.443350000000002 17.443350000000002 17.443350000000002