The intervention group used more health care resources : they paid an increased number of visits to the nurse ( IRR = 1.73 , P < .001 ) , spent more time at the nurse reception ( mean difference of 48.7 minutes , P < .001 ) , and there was a greater number of telephone contacts between the nurse and intervention patients ( IRR = 3.82 , P < .001 for nurse-induced contacts and IRR = 1.63 , P = .049 for patient-induced contacts ) .