condition mean min max ZT0-3 29.85 29.85 29.85 ZT4-7 3.9 3.9 3.9 ZT8-11 18.9 18.9 18.9 ZT12-15 4.1 4.1 4.1 ZT16-19 19.4 19.4 19.4 ZT20-23 14.1 14.1 14.1