condition mean min max ZT0-3 36.54214999999999 32.16025 40.924049999999994 ZT4-7 27.596899999999998 27.596899999999998 27.596899999999998 ZT8-11 18.24785 18.24785 18.24785 ZT12-15 0 0 0 ZT16-19 23.0865 23.0865 23.0865 ZT20-23 26.551099999999998 26.551099999999998 26.551099999999998