Background: The Haller index (HI) remains the standard metric to quantify the severity of pectus excavatum deformity. However, little data exist to determine how well this parameter correlates with the difficulty or early outcomes of repair. Methods: The study population was comprised of all patients who underwent pectus bar repair for pectus excavatum on whom adequate preoperative images on computed tomography allowed for Haller index calculation, from December 1999 to February 2010. Patients with two bars placed for repair were excluded. All images were reviewed blinded to outcome and Haller index was calculated. Pearson's correlation was used to evaluate the relationship between age, length of operation, postoperative complications, and length of hospitalization. The correlations were performed on the entire population and then individual age groups analyzed: 5-11 y, 12-16 y, and over 17 y. Two-tailed P values were determined from the correlation coefficient and significance was defined as P ≤ 0.05. Results: HI was available for 262 patients. There were 66 patients aged 5-11 y, 165 patients aged 12-16 years, and 30 patients over 17 y. The population was 80% male. In the entire population, there was a small correlation between postoperative pneumothorax and HI (R = 0.131, P = 0.05). There was no correlation between age, operative time, postoperative bar infection, or length of stay. No significant correlations existed in any of the individual age groups. Conclusion: The Haller index holds no correlation with age, operative time, postoperative bar infection, or length of stay. © 2011 Elsevier Inc. All rights reserved.