condition mean min max ZT0-3 928.090284 928.090284 928.090284 ZT4-7 809.2554265 809.2554265 809.2554265 ZT8-11 752.706412 752.706412 752.706412 ZT12-15 819.5841995000001 819.5841995000001 819.5841995000001 ZT16-19 940.678026 940.678026 940.678026 ZT20-23 971.588659 971.588659 971.588659