condition mean min max ZT0-3 195.304424525 144.20262775 246.4062213 ZT4-7 569.790035225 501.91029685000007 637.6697736 ZT8-11 525.047046575 466.54234825 583.5517449 ZT12-15 738.009277675 710.44960395 765.5689514000001 ZT16-19 619.900474925 587.0067694 652.7941804500001 ZT20-23 572.688124375 524.19885505 621.1773937