Strengthening Conclusion on Meditation and Anxiety

In a recent study, researchers examined the effects of meditation on anxiety levels in college students. They found that students who practiced meditation for at least 20 minutes a day reported significantly lower levels of anxiety compared to those who did not meditate. The researchers concluded that daily meditation could be an effective strategy for managing anxiety. However, they also acknowledged that there are many different factors that can contribute to anxiety levels, including academic pressure and social dynamics.

Given this context, which of the following statements most strengthens the researchers' conclusion?