condition mean min max ZT0-3 16.21445 15.318950000000001 16.915 ZT4-7 12.145980000000002 12.145980000000002 12.145980000000002 ZT8-11 9.605235 9.605235 9.605235 ZT12-15 10.2755825 9.029875 11.52129 ZT16-19 9.13578 9.13578 9.13578 ZT20-23 12.9211 12.9211 12.9211