condition mean min max ZT0-3 1.8131925 1.483185 2.1432 ZT4-7 0.8055655 0.8055655 0.8055655 ZT8-11 0.5704335 0.5704335 0.5704335 ZT12-15 0 0 0 ZT16-19 2.80608 2.80608 2.80608 ZT20-23 2.705915 2.705915 2.705915