Table 5.

Alternative Time Specifications. Poisson regression coefficients for economic variables associated with IMUI in an MSA-month for infants born in 26 MSAs of California, 1999–2003 (standard errors in parentheses)

	Model 1	Model 2
MSA employment variable lagged at:
0 months	−.0872 (.0498)*	−.0611 (.0588)
1 month	−.0060 (.0673)	−.0256 (.0684)
2 months	.0359 (.0583)	.0623 (.0601)
3 months	−.0220 (.0515)	−.0425 (.0570)
Population Offset Term	Yes	Yes
Dispersion Parameter	Yes	Yes
MSA Random Effects	Yes	Yes
Year and Calendar Month Indicators	Yes	--
72 (less 1) Month Indicators	--	Yes
Log Likelihood	−634.64	−608.81

^*p < 0.05, 1-tailed test