condition mean min max ZT0-3 336.70000000000005 336.70000000000005 336.70000000000005 ZT4-7 424.6 424.6 424.6 ZT8-11 438.9 438.9 438.9 ZT12-15 490.54999999999995 490.54999999999995 490.54999999999995 ZT16-19 441.25 441.25 441.25 ZT20-23 342.4 342.4 342.4