Table 6.

Logistic Regression of Factors (including flu shot status in 1998) Significantly Associated with Flu Shot in the Subsequent Year (1999)*

VariableBetaWald StatisticdfP Value
Flu shot in 19984.07321011<.01
No. of primary care provider claims in 1998−0.022241<.01
HMO member in 19980.470161<.01
Level of education−0.075121<.01
African American−0.38261<.05
Current smoker−0.32161<.05
Disease burden−0.05941<.05
  • * Flu shot: yes = 0, no = 1; for all categorical variables (African American, Hispanic ancestry, smoking, married?, HMO membership, living in urban area) yes = 0, no = 1.

  • Variables not statistically significant in the model: total number of physician claims, marital status, age, Hispanic ancestry, household income, self-reported health status, level of disability, living in an urban area, and number of specialist physician claims. R square of model = 0.64.