condition mean min max ZT0-3 27.039819975 19.3175016 34.76213835 ZT4-7 11.68541420425 10.170957118499999 13.19987129 ZT8-11 15.886924292499998 12.88452557 18.889323015 ZT12-15 17.2156823075 15.783992875000001 18.64737174 ZT16-19 21.341201615 19.929780174999998 22.752623055 ZT20-23 28.92963694 24.602608975000003 33.256664905