condition mean min max ZT0-3 4.95 4.95 4.95 ZT4-7 3.7 3.7 3.7 ZT8-11 5.8 5.8 5.8 ZT12-15 20.25 20.25 20.25 ZT16-19 16.15 16.15 16.15 ZT20-23 34.3 34.3 34.3