TABLE 2—

Ordinary Least Squares and Fixed-Effects Regressions of Logged Zip Code–Level Credit Card Default Rates on Logged Metropolitan Statistical Area–Level Influenza Severity: United States, 2004–2012

Search/Delinquency Rate	Ordinary Least Squares Regression Models,a b (95% CI)	Zip Code–Quarter Fixed-Effects Models,b b (95% CI)
Logged influenza searches
30-d	0.002 (–0.001, 0.005)	0.003*** (0.002, 0.005)
60-d	0.006*** (0.003, 0.007)	0.004*** (0.002, 0.005)
90-d	0.010*** (0.007, 0.012)	0.003*** (0.002, 0.004)
Any	0.011*** (0.008, 0.015)	0.003*** (0.001, 0.005)
Constant
30-d	–0.608*** (–0.672, −0.545)	0.199*** (0.184, 0.215)
60-d	–0.460*** (-0.506, −0.414)	0.121*** (0.108, 0.133)
90-d	–0.426*** (–0.466, −0.386)	0.089*** (0.078, 0.100)
Any	−1.12 (–1.22, −1.01)	0.386*** (0.364, 0.408)

Note. CI = confidence interval. Standard errors are corrected for clustering.

^a205 352 observations (9128 unique zip codes), with metropolitan statistical area and zip code level control variables.

^b291 488 observations (9197 unique zip codes), without metropolitan statistical area and zip code level control variables.

*P < .05; **P < .01; ***P < .001.