highly significantP < .05
All P values are reported numerically and interpreted for significance using the sliding-scale approach of Mendenhall et al 7 as follows: P < .01 is “highly significant,” .01 < P < .05 is “statistically significant,” .05 < P < .10 is “trending towards significant,” and P > .10 is “not significant.” Results Of the 988 patients with breast cancer seen in our institution during the 6-year study period, the number of patients who had a port placed for administration of chemotherapy was 297 (30%), which represents the total study population and is not significantly different from other institutions. 2 We looked at a total of 147 patients with arm ports and 150 patients with chest ports.