condition mean min max ZT0-3 0.7581990000000001 0.7581990000000001 0.7581990000000001 ZT4-7 0.646882 0.646882 0.646882 ZT8-11 0.47877800000000004 0.47877800000000004 0.47877800000000004 ZT12-15 0.3241795 0.3241795 0.3241795 ZT16-19 0.9188145 0.9188145 0.9188145 ZT20-23 0.8503769999999999 0.8503769999999999 0.8503769999999999