A Study Undertaken by Reed (2004) Looked at an Evaluation

A study undertaken by Reed (2004) looked at an evaluation of the effect of an intervention across medical care providers in an institution and at physician group practice level. The patient group were diabetics. Within the physician care group, there were a non-intervention group of patients and an intervention group. The following result was derived using the Pearson chi-square: χ² = 99.58, p = .0001 (source: http:/ / www.annfammed.org/ cgi/ reprint/ 2/ 3/ 201.pdf) . What does this suggest about the result?

A) No difference between the groups
B) A significant difference between the groups and intervention effective
C) A significant difference between the groups and intervention not effective
D) None of the above