A study prospectively examined whether sleep-disordered breathing was associated with an increased risk of death from any cause in a cohort of 600 adults participating in the Sleep Heart Health Study. Study participants were classified into four groups depending on the extent of their sleep-disordered breathing (none, mild, moderate, or severe). The counts of deaths over the course of the study are reported for each group in the following two-way table. Death No Death Total None 40 100 140 Mild 40 100 140 Moderate 20 100 120 Severe 100 100 Total 200 400 600 200 We want to know whether the study findings give evidence of a significant difference of the number of deaths between the different groups. The test statistic is: MSG F = MSE Pol-Po X² = 0-EF %3!
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