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. Author manuscript; available in PMC: 2011 Feb 21.
Published in final edited form as: J Neurosurg. 2010 Jul;113(1):32–38. doi: 10.3171/2009.12.JNS091073

FIG. 2.

FIG. 2

Bar graph showing the distribution of cases according to operative date. The Group B patients occur more frequently later in the study than Group A patients. The inset demonstrates results of the 1-way ANOVA of Group A (left) compared with Group B (right). Individual points within the graph represent individual cases according to year. The diamond shape represents the mean (center line) and the points of the diamond represent the 95% CIs. The 26 Group A cases occurred primarily in 2001 (95% CI 2000–2002), and the Group B cases in 2003 (95% CI 2002–2004), a statistically significant difference (p = 0.0022).