condition mean min max ZT0-3 113.26056 113.26056 113.26056 ZT4-7 168.11353450000001 168.11353450000001 168.11353450000001 ZT8-11 242.336365 242.336365 242.336365 ZT12-15 225.1814895 225.1814895 225.1814895 ZT16-19 193.488762 193.488762 193.488762 ZT20-23 164.3067905 164.3067905 164.3067905