condition mean min max ZT0-3 61.622906985 58.54062115 64.70519282000001 ZT4-7 69.70952309666667 69.56642994 69.85261625333334 ZT8-11 71.54203068 66.87148529666666 76.21257606333333 ZT12-15 74.11133033499999 73.82342435 74.39923632 ZT16-19 80.25979187499999 79.62729149333333 80.89229225666666 ZT20-23 75.74938709999999 74.78744781666666 76.71132638333333