condition mean min max ZT0-3 18.61628333333333 12.892299999999999 22.8761 ZT4-7 10.31693 10.31693 10.31693 ZT8-11 9.508725 9.508725 9.508725 ZT12-15 12.2549925 10.555135 13.95485 ZT16-19 14.21445 14.21445 14.21445 ZT20-23 23.59875 23.59875 23.59875