condition mean min max ZT0-3 50.5 50.5 50.5 ZT4-7 41.6 41.6 41.6 ZT8-11 38.8 38.8 38.8 ZT12-15 38.3 38.3 38.3 ZT16-19 39.85 39.85 39.85 ZT20-23 46.45 46.45 46.45