condition mean min max ZT0-3 14.197263 14.197263 14.197263 ZT4-7 11.9750125 11.9750125 11.9750125 ZT8-11 11.979878 11.979878 11.979878 ZT12-15 13.274806 13.274806 13.274806 ZT16-19 12.1857015 12.1857015 12.1857015 ZT20-23 12.2327515 12.2327515 12.2327515