condition mean min max ZT0-3 32.325557 32.325557 32.325557 ZT4-7 13.310931 13.310931 13.310931 ZT8-11 13.76531 13.76531 13.76531 ZT12-15 26.586157999999998 26.586157999999998 26.586157999999998 ZT16-19 21.594554000000002 21.594554000000002 21.594554000000002 ZT20-23 14.254533 14.254533 14.254533