condition mean min max ZT0-3 23.95 23.95 23.95 ZT4-7 3.9 3.9 3.9 ZT8-11 12.549999999999999 12.549999999999999 12.549999999999999 ZT12-15 8.149999999999999 8.149999999999999 8.149999999999999 ZT16-19 17.85 17.85 17.85 ZT20-23 27.450000000000003 27.450000000000003 27.450000000000003