condition mean min max ZT0-3 1.5010356666666667 0.852062 1.90274 ZT4-7 0.8937595 0.8937595 0.8937595 ZT8-11 1.080872 1.080872 1.080872 ZT12-15 1.07989575 0.9992924999999999 1.160499 ZT16-19 1.45843 1.45843 1.45843 ZT20-23 2.13808 2.13808 2.13808