condition mean min max ZT0-3 10.33821 9.423945 11.252475 ZT4-7 8.023725 8.023725 8.023725 ZT8-11 13.500350000000001 13.500350000000001 13.500350000000001 ZT12-15 0 0 0 ZT16-19 17.4799 17.4799 17.4799 ZT20-23 17.41735 17.41735 17.41735