condition mean min max ZT0-3 15.43195 12.5459 18.318 ZT4-7 38.84335 38.84335 38.84335 ZT8-11 75.03 75.03 75.03 ZT12-15 0 0 0 ZT16-19 54.39075 54.39075 54.39075 ZT20-23 29.03015 29.03015 29.03015