condition mean min max ZT0-3 63.35 63.35 63.35 ZT4-7 19.5 19.5 19.5 ZT8-11 38.15 38.15 38.15 ZT12-15 75.45 75.45 75.45 ZT16-19 77.35 77.35 77.35 ZT20-23 58.3 58.3 58.3