condition mean min max ZT0-3 25.15 25.15 25.15 ZT4-7 1.3 1.3 1.3 ZT8-11 19.6 19.6 19.6 ZT12-15 10.95 10.95 10.95 ZT16-19 10.15 10.15 10.15 ZT20-23 5.7 5.7 5.7