Doc, I understand your point. From a patients' perspective, it probably doesn't matter if it was an emergency room that saved their life or the overall quality of the hospital. And as you pointed out, obviously, when it comes to many diseases such as stroke, the immediate care is critical -- although even there that study looked at just mortality and a very small percentage of people die in the hospital. Yet, your quality of life after a stroke can vary dramatically, based on the emergency care you receive. A study that could somehow look at a broader array of outcomes than just mortality, which is very rare (only 3 percent of patients die in hospitals, according to what I just read) might be interesting. But your point makes sense to me. Maybe my questions missed the important point that it doesn't matter how you emerged from the hospital alive (emergency care or otherwise), just that the hospital overall did a good job.
That said, while you responded, I was looking at the full report and even though one of my questions was answered, it raised new questions. The cohorts WERE risk adjusted. I'll assume it was done using things that have been proven to increase mortality risk, such as age, gender and other conditions that are present. But that may be problematic in itself because of the source of the data. They use Medicare data, because it's a nationally-available database that gives them an identical source for their clinical data across all hospitals. However, based on what I was just reading, Medicare patients only account for slightly half of all hospital admissions and they exclude children and young adults. Also, Medicare coding (what they used to risk adjust their data) is apparently unreliable. Hospitals are in a constant battle to get maximum reimbursement from Medicare, and some hospitals --especially those that have a disproportionate number of Medicare patients -- may inflate the billing codes to make a patient's condition appear more complicated so the hospital can get a bigger Medicare reimbursement. Other hospitals are understaffed, so their coding is not done well. A hospital that is more forthright might actually be penalized for coding their data better than another hospital.
I also came across a few other things that were disturbing when looking at this. I had no familiarity with Healthgrades, but apparently there is a conflict of interest. Looking at their site and their last few SEC filings just now, there is a conflict of interest in their claim of being an independent evaluator. They charge hospitals to use their excellence awards for advertising and publicity purposes. It's actually a significant source of revenue for the company, according to their filings. I would think you have to be somewhat skeptical of a for-profit company that charges hospitals to use awards they reward for excellence, while the company is selling itself to the public as an independent evaluator.