condition mean min max ZT0-3 33.659742 33.659742 33.659742 ZT4-7 34.998512500000004 34.998512500000004 34.998512500000004 ZT8-11 38.6091375 38.6091375 38.6091375 ZT12-15 38.957066999999995 38.957066999999995 38.957066999999995 ZT16-19 69.3604155 69.3604155 69.3604155 ZT20-23 69.9792375 69.9792375 69.9792375