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. Author manuscript; available in PMC: 2009 Apr 2.
Published in final edited form as: JAMA. 2008 Jul 16;300(3):287–294. doi: 10.1001/jama.300.3.287

Figure 2. Interaction Between Baseline Score and Effect of Simvastatin on Object Assembly Test Results.

Figure 2

For each subgroup, individual z scores and uncorrected group mean z scores are provided. For each subgroup, the left range shows scores at baseline and the right range, scores at 12 weeks. For the simvastatin group, n=16 for the low baseline score at baseline but n=15 for the low baseline score at 12 weeks; n=15 for the high baseline score. For the placebo group, n=22 for the low baseline score, and n=9 for the high baseline score. The difference between the simvastatin and placebo groups after 12 weeks is significant in the groups with low baseline performance (β=0.80; 95% confidence interval, 0.29 to 1.30; P=.003), but not in the groups with high baseline performance (β=0.47; 95% confidence interval, −0.64 to 1.59). Error bars represent 95% confidence intervals.