condition mean min max ZT0-3 270.817128 270.817128 270.817128 ZT4-7 222.9312645 222.9312645 222.9312645 ZT8-11 60.14549100000001 60.14549100000001 60.14549100000001 ZT12-15 56.4502025 56.4502025 56.4502025 ZT16-19 40.1300325 40.1300325 40.1300325 ZT20-23 75.353055 75.353055 75.353055