condition mean min max ZT0-3 13.42585 12.55695 14.29475 ZT4-7 14.68725 14.68725 14.68725 ZT8-11 25.817700000000002 25.817700000000002 25.817700000000002 ZT12-15 0 0 0 ZT16-19 24.2144 24.2144 24.2144 ZT20-23 20.097299999999997 20.097299999999997 20.097299999999997