condition mean min max ZT0-3 53.60825 53.60825 53.60825 ZT4-7 40.90145 40.90145 40.90145 ZT8-11 54.62264999999999 54.62264999999999 54.62264999999999 ZT12-15 66.28014999999999 66.28014999999999 66.28014999999999 ZT16-19 67.30924999999999 67.30924999999999 67.30924999999999 ZT20-23 58.963350000000005 58.963350000000005 58.963350000000005