condition mean min max ZT0-3 48.25377367749999 17.394130235 79.11341712 ZT4-7 11.00487617875 7.8626381925 14.147114164999998 ZT8-11 20.126066295 19.0171153 21.23501729 ZT12-15 14.256898068749999 13.365594847499999 15.14820129 ZT16-19 10.2042438255 9.534702031 10.87378562 ZT20-23 8.946029409000001 8.8317141095 9.0603447085