Both the correlation as well as the funnel plot shown are suggestive of publication bias. The funnel plot is suggestive of publication bias because of missing values on the bottom right side of the graph. This data is from a study we published on the effects of aerobic exercise on resting blood pressure in women (See: Kelley GA, Kelley KS. Aerobic exercise and resting blood pressure in women: a meta-analytic review of controlled clinical trials. Journal of Women's Health & Gender-Based Medicine 8:787-803, 1999).