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Table 4 Five-Year (2000–2004) Incidence Rates of Invasive Breast Cancer for Kaiser Permanente Female Members Aged 40–64 in Marin County and East/Central Contra Costa County, California1

From: Differences in reproductive risk factors for breast cancer in middle-aged women in Marin County, California and a sociodemographically similar area of Northern California

  Marin East/Central Contra Costa p-value
Number of cases/Population 184/65,937 384/148,388  
Five-year rate per 100,000 women adjusted for age 257.7 (220.9 – 298.8) 240.5 (216.8 – 266.0) p = .69
Five-year rate per 100,000 women adjusted for age and ethnicity 264.7 (224.6 – 309.8) 245.7 (218.9 – 274.9) p = .74
  1. 1 Rates adjusted to the age and race/ethnic (White nonHispanic vs. Other) composition of the female population in each geographic area per U.S. Census 2000 estimates.