condition mean min max ZT0-3 16.72185 16.72185 16.72185 ZT4-7 14.7986 14.7986 14.7986 ZT8-11 11.458400000000001 11.458400000000001 11.458400000000001 ZT12-15 11.0883 11.0883 11.0883 ZT16-19 13.29505 13.29505 13.29505 ZT20-23 16.31885 16.31885 16.31885