condition mean min max ZT0-3 12.5001 12.5001 12.5001 ZT4-7 15.4042 15.4042 15.4042 ZT8-11 13.66505 13.66505 13.66505 ZT12-15 9.52629 9.52629 9.52629 ZT16-19 16.0965 16.0965 16.0965 ZT20-23 12.5152 12.5152 12.5152