condition mean min max ZT0-3 14.7677 12.69405 16.84135 ZT4-7 12.1366 12.1366 12.1366 ZT8-11 11.29715 11.29715 11.29715 ZT12-15 0 0 0 ZT16-19 12.531949999999998 12.531949999999998 12.531949999999998 ZT20-23 14.0976 14.0976 14.0976