condition mean min max ZT0-3 56.91171666666667 53.93825 62.458200000000005 ZT4-7 46.69185 46.69185 46.69185 ZT8-11 34.52075 34.52075 34.52075 ZT12-15 46.92275 46.3228 47.5227 ZT16-19 44.4533 44.4533 44.4533 ZT20-23 62.615849999999995 62.615849999999995 62.615849999999995