condition mean min max ZT0-3 0.0739365 0.0715655 0.0769055 ZT4-7 0.36037300000000005 0.36037300000000005 0.36037300000000005 ZT8-11 0.7366485 0.7366485 0.7366485 ZT12-15 0.22436050000000002 0.215248 0.233473 ZT16-19 0.27984 0.27984 0.27984 ZT20-23 0.315679 0.315679 0.315679