condition mean min max ZT0-3 0.5902925 0.5902925 0.5902925 ZT4-7 0.4914265 0.4914265 0.4914265 ZT8-11 0.358514 0.358514 0.358514 ZT12-15 0.3803485 0.3803485 0.3803485 ZT16-19 0.4539785 0.4539785 0.4539785 ZT20-23 0.637985 0.637985 0.637985