condition mean min max ZT0-3 16.6344 16.6344 16.6344 ZT4-7 16.377299999999998 16.377299999999998 16.377299999999998 ZT8-11 14.136849999999999 14.136849999999999 14.136849999999999 ZT12-15 14.89875 14.89875 14.89875 ZT16-19 21.4408 21.4408 21.4408 ZT20-23 17.32045 17.32045 17.32045