condition mean min max ZT0-3 4.076075 3.06997 4.92464 ZT4-7 3.34321 3.34321 3.34321 ZT8-11 3.196675 3.196675 3.196675 ZT12-15 5.5754025 5.558905 5.5919 ZT16-19 5.02581 5.02581 5.02581 ZT20-23 5.756405000000001 5.756405000000001 5.756405000000001