condition mean min max ZT0-3 15.5041 14.92015 16.08805 ZT4-7 23.80425 23.80425 23.80425 ZT8-11 19.16215 19.16215 19.16215 ZT12-15 0 0 0 ZT16-19 11.7236 11.7236 11.7236 ZT20-23 17.426299999999998 17.426299999999998 17.426299999999998