condition mean min max ZT0-3 27.5 27.5 27.5 ZT4-7 5.2 5.2 5.2 ZT8-11 15.95 15.95 15.95 ZT12-15 33.45 33.45 33.45 ZT16-19 8.1 8.1 8.1 ZT20-23 22.45 22.45 22.45