condition mean min max ZT0-3 9.312494999999998 9.234805 9.390184999999999 ZT4-7 13.4435 13.4435 13.4435 ZT8-11 18.22615 18.22615 18.22615 ZT12-15 0 0 0 ZT16-19 9.44903 9.44903 9.44903 ZT20-23 12.8817 12.8817 12.8817