condition mean min max ZT0-3 0.7154355 0.558028 0.872843 ZT4-7 0.5682785 0.5682785 0.5682785 ZT8-11 0.46416999999999997 0.46416999999999997 0.46416999999999997 ZT12-15 0 0 0 ZT16-19 1.00977 1.00977 1.00977 ZT20-23 0.8628435 0.8628435 0.8628435