One of the criticisms of the whitehall study is that the researchers did not adequately address the possibility that occupational and health differences were caused by:

One of the criticisms of the Whitehall Study it that the researchers did not adequately address the possibility that occupational and health differences were caused by underlying personality differences. The Whitehall study compared the morality rate of those that were in the highly stratified environment of the British Civil Service.

It’s because it’s was very fun