condition mean min max ZT0-3 27.7 27.7 27.7 ZT4-7 22.7 22.7 22.7 ZT8-11 32.3 32.3 32.3 ZT12-15 22.95 22.95 22.95 ZT16-19 8.299999999999999 8.299999999999999 8.299999999999999 ZT20-23 14.9 14.9 14.9