Factor^{†} | MDs/1000 Infants^{‡} | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Pediatric | Family | General | ||||||||||||||||

Bivariate | Multivariate | Bivariate | Multivariate | Bivariate | Multivariate | |||||||||||||

R^{2} | β | PValue | R^{2} | β | PValue | R^{2} | β | PValue | R^{2} | β | PValue | R^{2} | β | PValue | R^{2} | β | PValue | |

MDs/1000 | ||||||||||||||||||

Pediatric | NA | NA | NA | NA | NA | NA | .107 | −.430 | .018^{*} | .001 | −.001 | .990 | ||||||

Family | .107 | −.250 | .019^{*} | NA | NA | NA | NA | NA | NA | .107 | +.069 | .019^{*} | ||||||

General | .001 | −.006 | .990 | .106 | +1.543 | .019^{*} | NA | NA | NA | NA | NA | NA | ||||||

Resident | .752 | +14.887 | .001^{*} | +14.537 | .001^{*} | .115 | −7.647 | .015^{*} | .015 | −.583 | .393 | |||||||

Demographic | ||||||||||||||||||

Urban% | .134 | +.091 | .008^{*} | .406 | −.209 | .001^{*} | −.128 | .006^{*} | .107 | −.023 | .019^{*} | |||||||

Minority% | .129 | +.075 | .010^{*} | .401 | −.174 | .001^{*} | −.103 | .008^{*} | .002 | −.003 | .756 | |||||||

Economic | ||||||||||||||||||

House income | .079 | +.001 | .045^{*} | +.001 | .006^{*} | .034 | −.001 | .192 | .153 | −.001 | .005^{*} | −.001 | .003^{*} | |||||

Medicaid fee | .021 | −.074 | .306 | .065 | −.169 | .072 | .076 | −.039 | .051 | −.039 | .033^{*} | |||||||

Vaccine distrib. | .004 | + | .900 | .062 | + | .218 | .001 | + | .979 | |||||||||

First $ insure | .078 | + | .048^{*} | .001 | + | .857 | .044 | + | .141 | |||||||||

Model | NA | NA | NA | .788 | NA | .001^{*} | NA | NA | NA | .488 | NA | .001^{*} | NA | NA | NA | .230 | NA | .002^{*} |

NA indicates not applicable.

Blank, in multivariate analysis indicates factor not statistically significant at

*P*< .05 level.↵* Factor statistically significant at

*P*< .05 level.↵† All factors but Vaccine Distrib. and First $ Insure are continuous variables.

↵‡ Number of office-based physicians in each specialty (according to American Medical Association Masterfile) divided by birth cohort (according to National Center for Health Statistics) and multiplied by 1000.

Resident = intern and resident physicians; Urban% = proportion of total population living in metropolitan statistical areas; Minority% = proportion of births that are other than non-Hispanic white; House. Income = median household income in dollars; Medicaid Fee = fee in dollars paid by Medicaid for administration of 3 vaccinations; Vaccine Distrib. = vaccine distribution system: (1) Universal; (2) Vaccines for Children (VFC) for public and private providers; or (3) VFC for public providers only. Since it is a categorical variable, β values are not calculated, but a plus sign is indicated in the β column if states with Universal distribution had a higher mean number of MDs/1000 infants than states with other distribution systems; First $ Insure = law requiring that vaccinations be reimbursed by third party payors with no copayment or deductible: Yes or No. Since it is a categorical variable, β values are not calculated, but a plus sign is indicated in the β column if states with such a law had a higher mean number of MDs/1000 infants than states without such a law.