A researcher studied 100 patients to determine if there was…

A researcher studied 100 patients to determine if there was a significant difference among five drugs for relief of arthritis pain.  Pain was measured using a standardized scale from 0-100, with 0 indicating no pain.   The decrease in pain over 1 month was evaluated.  A one-way ANOVA was significant, and the results below show the amount of pain relief using a Student-Newman Keuls comparison.  Which of the following statements is not a correct conclusion?