condition mean min max ZT0-3 342.7 342.7 342.7 ZT4-7 183.1 183.1 183.1 ZT8-11 236.75 236.75 236.75 ZT12-15 324.29999999999995 324.29999999999995 324.29999999999995 ZT16-19 377.55 377.55 377.55 ZT20-23 477.9 477.9 477.9