condition mean min max ZT0-3 1.851092 1.658674 2.04351 ZT4-7 0.5611965 0.5611965 0.5611965 ZT8-11 0.31133299999999997 0.31133299999999997 0.31133299999999997 ZT12-15 0 0 0 ZT16-19 0.730305 0.730305 0.730305 ZT20-23 1.46845 1.46845 1.46845