condition mean min max ZT0-3 43.167775 30.580849999999998 55.7547 ZT4-7 10.262205 10.262205 10.262205 ZT8-11 11.23365 11.23365 11.23365 ZT12-15 0 0 0 ZT16-19 17.083599999999997 17.083599999999997 17.083599999999997 ZT20-23 15.71875 15.71875 15.71875