condition mean min max ZT0-3 2.28023187075 1.880045026 2.6804187155 ZT4-7 2.796066962 2.2739623445 3.3181715794999995 ZT8-11 5.72884326 4.5531067290000005 6.904579791 ZT12-15 5.219307337 4.867091306 5.571523368 ZT16-19 3.36597376625 3.2865933925000004 3.44535414 ZT20-23 4.1137457115 4.012704084 4.214787339