| Provider identified by specialty code | Provider identified by billing code | Absolute difference | p-value |
---|---|---|---|---|
All registries | 23.8Â % | 35.7Â % | 11.9Â % | <0.0001 |
Connecticut | 23.5Â % | 36.0Â % | 12.4Â % | <0.0001 |
Iowa | 17.9Â % | 35.0Â % | 17.1Â % | <0.0001 |
New Jersey | 26.9Â % | 43.5Â % | 16.6Â % | <0.0001 |