condition mean min max ZT0-3 22.708849999999998 22.708849999999998 22.708849999999998 ZT4-7 20.554049999999997 20.554049999999997 20.554049999999997 ZT8-11 22.11045 22.11045 22.11045 ZT12-15 22.27205 22.27205 22.27205 ZT16-19 20.32865 20.32865 20.32865 ZT20-23 24.0242 24.0242 24.0242