condition mean min max ZT0-3 12.149999999999999 12.149999999999999 12.149999999999999 ZT4-7 8.4 8.4 8.4 ZT8-11 18.950000000000003 18.950000000000003 18.950000000000003 ZT12-15 8.95 8.95 8.95 ZT16-19 22.25 22.25 22.25 ZT20-23 5.949999999999999 5.949999999999999 5.949999999999999