condition mean min max ZT0-3 52.85 52.85 52.85 ZT4-7 37.5 37.5 37.5 ZT8-11 30.55 30.55 30.55 ZT12-15 41.8 41.8 41.8 ZT16-19 48.7 48.7 48.7 ZT20-23 48.55 48.55 48.55