[don-o]

Actually they controlled for appendicitis.

[Red in Blue PA]

Actually they controlled for appendicitis.

Was it controlled for Headaches? How about a stubbed toe?

[Little Ray]

I wonder if they controlled for the hospitals?

For instance, not a lot of whites end up in Grady in downtown Atlanta, esp. for appendicitis, but plenty do at NE Georgia. They might have different policies at different hospitals frequented by different races on pain killers.