condition mean min max ZT0-3 3.3641125 3.0983099999999997 3.629915 ZT4-7 2.345295 2.345295 2.345295 ZT8-11 9.410609999999998 9.410609999999998 9.410609999999998 ZT12-15 0 0 0 ZT16-19 7.51336 7.51336 7.51336 ZT20-23 5.605964999999999 5.605964999999999 5.605964999999999