condition mean min max ZT0-3 25.95 25.95 25.95 ZT4-7 4.1 4.1 4.1 ZT8-11 2.55 2.55 2.55 ZT12-15 17.95 17.95 17.95 ZT16-19 8.6 8.6 8.6 ZT20-23 15.65 15.65 15.65