condition mean min max ZT0-3 27.979833333333332 16.254649999999998 34.092749999999995 ZT4-7 13.404399999999999 13.404399999999999 13.404399999999999 ZT8-11 10.753565 10.753565 10.753565 ZT12-15 15.723524999999999 14.5846 16.86245 ZT16-19 22.0908 22.0908 22.0908 ZT20-23 36.53685 36.53685 36.53685