condition mean min max ZT0-3 1.9770275000000002 1.429835 2.52422 ZT4-7 1.9499 1.9499 1.9499 ZT8-11 1.165678 1.165678 1.165678 ZT12-15 0 0 0 ZT16-19 1.3740219999999999 1.3740219999999999 1.3740219999999999 ZT20-23 1.682785 1.682785 1.682785