A 29-year-old male core trainee at a hospital journal club presents a forest plot of odds ratios comparing an antipsychotic with placebo for relapse. The vertical line sits at 1. Lower values favour the antipsychotic. Study C has an odds ratio of 0.5 with a 95% confidence interval from 0.3 to 0.8. Which feature of Study C's row shows that its result is statistically significant?
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