condition mean min max ZT0-3 0.717891 0.717891 0.717891 ZT4-7 0.3282735 0.3282735 0.3282735 ZT8-11 1.8406500000000001 1.8406500000000001 1.8406500000000001 ZT12-15 4.590075000000001 4.590075000000001 4.590075000000001 ZT16-19 4.194226666666666 4.194226666666666 4.194226666666666 ZT20-23 1.68232 1.68232 1.68232