condition mean min max ZT0-3 71.132448 71.132448 71.132448 ZT4-7 133.735918 133.735918 133.735918 ZT8-11 140.0462945 140.0462945 140.0462945 ZT12-15 112.81169299999999 112.81169299999999 112.81169299999999 ZT16-19 97.04023000000001 97.04023000000001 97.04023000000001 ZT20-23 68.8012095 68.8012095 68.8012095