condition mean min max ZT0-3 18.35 18.35 18.35 ZT4-7 20.3 20.3 20.3 ZT8-11 6.3 6.3 6.3 ZT12-15 9.55 9.55 9.55 ZT16-19 5.85 5.85 5.85 ZT20-23 25.9 25.9 25.9