condition mean min max ZT0-3 9.353245 9.353245 9.353245 ZT4-7 9.309878000000001 9.309878000000001 9.309878000000001 ZT8-11 8.600859 8.600859 8.600859 ZT12-15 8.884007 8.884007 8.884007 ZT16-19 10.59267 10.59267 10.59267 ZT20-23 9.745255 9.745255 9.745255