condition mean min max ZT0-3 49.15708414775 12.4069081455 85.90726015 ZT4-7 7.0430164725 6.885594802 7.200438143 ZT8-11 6.75916061525 6.676057866000001 6.8422633645 ZT12-15 8.36261492275 7.064345965499999 9.66088388 ZT16-19 10.691187422750001 10.546769670500002 10.835605175000001 ZT20-23 10.996904513 10.519698666 11.474110360000001