condition mean min max ZT0-3 24.7071 24.7071 24.7071 ZT4-7 25.2325 25.2325 25.2325 ZT8-11 19.877499999999998 19.877499999999998 19.877499999999998 ZT12-15 18.94265 18.94265 18.94265 ZT16-19 16.0978 16.0978 16.0978 ZT20-23 22.6147 22.6147 22.6147