condition mean min max ZT0-3 45.9 45.9 45.9 ZT4-7 6.2 6.2 6.2 ZT8-11 59.85 59.85 59.85 ZT12-15 16.85 16.85 16.85 ZT16-19 51.55 51.55 51.55 ZT20-23 20.35 20.35 20.35