Filtering relations between co-occurring gene-gene or gene-disease terms at increasing number of intervening content words. Content word distance indicates the maximum distance in number of intervening meaningful words between two cooccurring gene-gene or gene-disease terms in the relations retained after filtering. "All" refers to no filtering. Precision (P), Recall (R), and F score (F) were calculated as follows: P = rc/(rc+ri), R = rc/(rc+dc), F = 2*P*R/(P+R) with rc the retained correct relations, ri the retained incorrect relations, and dc the discarded correct relations. Dotted lines indicate limits of 95% confidence intervals.