condition mean min max ZT0-3 2.5369002512499996 2.4332812059999998 2.6405192965 ZT4-7 3.135101395 3.0081456565 3.2620571335 ZT8-11 2.8525058155 2.038161397 3.666850234 ZT12-15 2.3327740385 1.7853244 2.880223677 ZT16-19 1.83592047625 1.4321826880000001 2.2396582645 ZT20-23 1.77347679725 1.7188661650000001 1.8280874295