condition mean min max ZT0-3 36.29185 36.29185 36.29185 ZT4-7 28.86795 28.86795 28.86795 ZT8-11 30.747149999999998 30.747149999999998 30.747149999999998 ZT12-15 33.62225 33.62225 33.62225 ZT16-19 39.54255 39.54255 39.54255 ZT20-23 37.7238 37.7238 37.7238