condition mean min max ZT0-3 373.20000000000005 373.20000000000005 373.20000000000005 ZT4-7 426.5 426.5 426.5 ZT8-11 342.85 342.85 342.85 ZT12-15 375.75 375.75 375.75 ZT16-19 382.65 382.65 382.65 ZT20-23 420.3 420.3 420.3