condition mean min max ZT0-3 11.230046 11.230046 11.230046 ZT4-7 11.248925 11.248925 11.248925 ZT8-11 11.262058 11.262058 11.262058 ZT12-15 11.274097000000001 11.274097000000001 11.274097000000001 ZT16-19 12.6093815 12.6093815 12.6093815 ZT20-23 12.3494475 12.3494475 12.3494475