condition mean min max ZT0-3 1.5059513500000001 0.04784805 3.9817705 ZT4-7 0.12838295 0.12838295 0.12838295 ZT8-11 0.26358000000000004 0.26358000000000004 0.26358000000000004 ZT12-15 1.49377525 1.447763 1.5397875 ZT16-19 1.6439920000000001 1.6439920000000001 1.6439920000000001 ZT20-23 0.46569150000000004 0.46569150000000004 0.46569150000000004