condition mean min max ZT0-3 19.95 19.95 19.95 ZT4-7 17.6 17.6 17.6 ZT8-11 5.35 5.35 5.35 ZT12-15 18.200000000000003 18.200000000000003 18.200000000000003 ZT16-19 25.25 25.25 25.25 ZT20-23 24.849999999999998 24.849999999999998 24.849999999999998