condition mean min max ZT0-3 23.58035 21.4463 26.142249999999997 ZT4-7 23.65835 23.65835 23.65835 ZT8-11 17.791 17.791 17.791 ZT12-15 22.107875 21.37975 22.836 ZT16-19 19.16075 19.16075 19.16075 ZT20-23 24.155299999999997 24.155299999999997 24.155299999999997