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| IA frequency in ID patients | IA frequency in controls | Z-test, P-value | |
|---|---|---|---|
| North | 0.8% (17/2142) | 0.8% (4/512) | −0.255, P>0.05 |
| East | 1.3% (21/1550) | 1.1% (11/988) | 0.346, P>0.05 |
| Northwest | 3.2% (18/570) | 3.6% (199/5500) | 0.445, P>0.05 |
| Northeast | 1.8% (86/4753) | 1.8% (5/275) | −0.221, P>0.05 |
