condition mean min max ZT0-3 15.632750000000001 13.828800000000001 17.436700000000002 ZT4-7 7.03032 7.03032 7.03032 ZT8-11 13.7439 13.7439 13.7439 ZT12-15 0 0 0 ZT16-19 42.1486 42.1486 42.1486 ZT20-23 23.053449999999998 23.053449999999998 23.053449999999998