condition mean min max ZT0-3 40.297788 40.297788 40.297788 ZT4-7 76.93389 76.93389 76.93389 ZT8-11 79.037823 79.037823 79.037823 ZT12-15 92.3660885 92.3660885 92.3660885 ZT16-19 66.423989 66.423989 66.423989 ZT20-23 61.598062 61.598062 61.598062