condition mean min max ZT0-3 16.4 16.4 16.4 ZT4-7 3.7 3.7 3.7 ZT8-11 2.15 2.15 2.15 ZT12-15 16.95 16.95 16.95 ZT16-19 10.55 10.55 10.55 ZT20-23 17.05 17.05 17.05