condition mean min max ZT0-3 212.295238 212.295238 212.295238 ZT4-7 481.1707255 481.1707255 481.1707255 ZT8-11 266.23825750000003 266.23825750000003 266.23825750000003 ZT12-15 151.7410375 151.7410375 151.7410375 ZT16-19 123.568581 123.568581 123.568581 ZT20-23 372.261186 372.261186 372.261186