condition mean min max ZT0-3 2886.015875 2886.015875 2886.015875 ZT4-7 2354.92477 2354.92477 2354.92477 ZT8-11 1797.0231105 1797.0231105 1797.0231105 ZT12-15 2207.8809 2207.8809 2207.8809 ZT16-19 1360.6176025 1360.6176025 1360.6176025 ZT20-23 1473.055358 1473.055358 1473.055358