condition mean min max ZT0-3 12.875575 12.29135 13.4598 ZT4-7 13.56595 13.56595 13.56595 ZT8-11 13.39345 13.39345 13.39345 ZT12-15 0 0 0 ZT16-19 25.835549999999998 25.835549999999998 25.835549999999998 ZT20-23 17.028200000000002 17.028200000000002 17.028200000000002