condition mean min max ZT0-3 2.46081 1.7947899999999999 3.00982 ZT4-7 2.32673 2.32673 2.32673 ZT8-11 1.362025 1.362025 1.362025 ZT12-15 2.553365 1.989655 3.117075 ZT16-19 1.2156099999999999 1.2156099999999999 1.2156099999999999 ZT20-23 1.9966650000000001 1.9966650000000001 1.9966650000000001