The state-time interactions capture not only state-specific differences in the level of
health insurance, but also state-specific changes in health insurance coverage rates (induced
perhaps by varying economic and political conditions). Similarly, the state-immigration
status interactions net out the possibility that there may be state differences in health
insurance coverage (and in the trends) across the various immigration status groups. Finally,
the last two columns of Table 4 replicate the regression analysis in the sample of
children