Snoring and heart disease

When the variable of most interest has only two categories and all probabilities for one category are small, standard clustered and stacked bar charts do not display differences between the groups well.

Choose Propns for Disease to show a simple bar chart of the proportions.

Are snoring and heart disease related? The table below classifies 2,484 subjects by the amount that they snored (reported by their spouses) and whether they had a history of heart disease.

  Heart disease  
  Yes No Total
Non-snorer 24 1355 1479
Occasional snorer 35 603 638
Snores most nights 21 192 213
Snores every night 30 224 254