condition mean min max ZT0-3 9.05 9.05 9.05 ZT4-7 3.7 3.7 3.7 ZT8-11 27.9 27.9 27.9 ZT12-15 4.95 4.95 4.95 ZT16-19 14.149999999999999 14.149999999999999 14.149999999999999 ZT20-23 16.7 16.7 16.7