condition mean min max ZT0-3 0.9289845 0.884935 0.973034 ZT4-7 1.082925 1.082925 1.082925 ZT8-11 2.9269049999999996 2.9269049999999996 2.9269049999999996 ZT12-15 0 0 0 ZT16-19 3.8272399999999998 3.8272399999999998 3.8272399999999998 ZT20-23 2.279635 2.279635 2.279635