condition mean min max ZT0-3 29.7 29.7 29.7 ZT4-7 15.8 15.8 15.8 ZT8-11 29.95 29.95 29.95 ZT12-15 14.05 14.05 14.05 ZT16-19 12.149999999999999 12.149999999999999 12.149999999999999 ZT20-23 32.05 32.05 32.05