Fig. 3From: Elevated blood urea nitrogen is associated with recurrence of post-operative chronic subdural hematomaAssociation of BUN levels with risk of Recurrence. Dashed lines are 95% confidence intervals. Dotted line is where BUN concentration is 6.4 mmol/L. Odds ratios and 95% confidence intervals derived from restricted cubic spline regression. Odds ratios were estimated using logistic regression modeling, adjusting for the same variables as model 3 in Table 5Back to article page