condition mean min max ZT0-3 17.21865 16.4807 17.84065 ZT4-7 13.511949999999999 13.511949999999999 13.511949999999999 ZT8-11 15.68625 15.68625 15.68625 ZT12-15 16.7138 15.75955 17.66805 ZT16-19 14.324200000000001 14.324200000000001 14.324200000000001 ZT20-23 18.2349 18.2349 18.2349