condition mean min max ZT0-3 728.232057 728.232057 728.232057 ZT4-7 509.332866 509.332866 509.332866 ZT8-11 462.01626550000003 462.01626550000003 462.01626550000003 ZT12-15 608.8478225 608.8478225 608.8478225 ZT16-19 811.2386875 811.2386875 811.2386875 ZT20-23 872.3788425 872.3788425 872.3788425