condition mean min max ZT0-3 0.9650391666666667 0.0 1.656745 ZT4-7 1.194005 1.194005 1.194005 ZT8-11 0.0 0.0 0.0 ZT12-15 0.4032675 0.0 0.806535 ZT16-19 0.3907195 0.3907195 0.3907195 ZT20-23 0.440578 0.440578 0.440578