Table 3 .
Observed vs Expected HER2-Positive Rates in California by NCI-Modified Health Service Area Using Multivariate Logistic Regression Modela
| NCI-Modified Health Service Area (California) | Observed % HER2 Positive | Expected % HER2 Positive | χ 2 P Value |
|---|---|---|---|
| Santa Barbara (Santa Barbara)–San Luis Obispo | 11.69 | 14.35 | .0033 |
| Marin | 12.00 | 13.29 | .3104 |
| Inyo–Mono | 13.89 | 15.96 | .6690 |
| Butte (Chico)–Tehama | 14.37 | 14.33 | .9764 |
| Ventura | 14.57 | 15.88 | .1624 |
| San Diego (San Diego)–Imperial | 14.60 | 15.83 | .0104 |
| Fresno (Fresno)–Kings | 14.65 | 18.91 | <.0001 |
| Alameda (Oakland)–Contra Costa | 14.78 | 15.88 | .0323 |
| Humboldt | 15.56 | 14.82 | .7479 |
| Sutter (Yuba City)–Yuba | 15.87 | 16.50 | .7694 |
| Solano (Vallejo)–Napa | 15.95 | 15.83 | .9116 |
| Santa Cruz | 16.12 | 15.42 | .7055 |
| Del Norte | 16.19 | 17.40 | .8152 |
| Santa Clara (San Jose)–Monterey | 16.30 | 15.41 | .1375 |
| Sacramento (Sacramento)–Placer | 16.39 | 16.11 | .6392 |
| Orange | 16.52 | 15.37 | .0230 |
| San Francisco (San Francisco)–San Mateo | 16.59 | 15.35 | .0618 |
| San Joaquin (Stockton)–Calaveras | 16.67 | 18.12 | .2027 |
| Stanislaus (Modesto)–Merced | 16.93 | 17.73 | .4607 |
| Nevada–Sierra | 17.04 | 13.85 | .1341 |
| Kern | 17.20 | 18.03 | .4997 |
| San Bernardino–Riverside (Riverside) | 17.29 | 18.23 | .0634 |
| Sonoma (Santa Rosa) | 17.43 | 15.85 | .1721 |
| Siskiyou | 17.98 | 14.15 | .3254 |
| Lassen–Plumas | 18.05 | 14.23 | .3972 |
| Los Angeles (Los Angeles) | 18.62 | 17.72 | .0040 |
| Mendocino | 20.11 | 19.23 | .8299 |
| Tulare | 20.21 | 19.52 | .7042 |
| Shasta (Redding)–Trinity | 22.99 | 16.66 | .0015 |
HER2, human epidermal growth factor receptor 2; NCI, National Cancer Institute.
aItalicized rows are results with significantly lower HER2 percentages than expected. Bold rows are results with significantly higher HER2 percentages than expected.