condition mean min max ZT0-3 81.79416666666667 64.30795 91.61525 ZT4-7 54.70355 54.70355 54.70355 ZT8-11 47.55345 47.55345 47.55345 ZT12-15 62.46485 59.019 65.91069999999999 ZT16-19 66.9216 66.9216 66.9216 ZT20-23 95.27255 95.27255 95.27255