Figure 2From: Nitrous oxide may not increase the risk of cancer recurrence after colorectal surgery: a follow-up of a randomized controlled trial Kaplan-Meier Estimates (and 95% Equal Precision Confidence Bands) of recurrence-free survival for 107 Colorectal Cancer Patients Receiving Nitrogen Gas (solid confidence bands) and 97 Receiving Nitrous Oxide Gas (dotted confidence bands). Multivariable P = 0.72.Back to article page