condition mean min max ZT0-3 11.460729 11.460729 11.460729 ZT4-7 11.735921000000001 11.735921000000001 11.735921000000001 ZT8-11 11.766412500000001 11.766412500000001 11.766412500000001 ZT12-15 10.5546035 10.5546035 10.5546035 ZT16-19 11.0966845 11.0966845 11.0966845 ZT20-23 11.013302 11.013302 11.013302