condition mean min max ZT0-3 4.410995 4.410995 4.410995 ZT4-7 4.79101 4.79101 4.79101 ZT8-11 5.219245 5.219245 5.219245 ZT12-15 3.462815 3.462815 3.462815 ZT16-19 3.06212 3.06212 3.06212 ZT20-23 2.5855550000000003 2.5855550000000003 2.5855550000000003