TABLE 1—

Descriptive Statistics and Bivariate Association Between Influenza-Related Google Searches and 30-, 60-, and 90-Day Credit Card and Mortgage Delinquency Rates: United States, 2004–2012

	Univariate Statistics			Bivariate Statistics: Influenza Searches
Variable	Mean (SD)	Min	Max	Low	Mid	High	F-testa
Logged influenza searches	10.07 (1.362)	0	12.90
Logged credit card default rates
30-day defaults	0.413 (0.878)	0	16	0.220	0.211	0.197	44.75***
60-day defaults	0.262 (0.694)	0	18	0.225	0.218	0.217	3.85*
90-day defaults	0.201 (0.605)	0	18	0.169	0.170	0.177	3.94*
Logged mortgage default rates
30-day defaults	0.199 (0.528)	0	34	0.211	0.219	0.221	4.96**
60-day defaults	0.080 (0.317)	0	9	0.076	0.089	0.095	43.55***
90-day defaults	0.042 (0.228)	0	12	0.366	0.467	0.535	59.95***
Control variables
% vaccinated	27.26 (20.89)	0	62.89
Unemployment rate	6.116 (2.582)	0	18.37
% some college	39.99 (27.44)	0	90.82
% older than 65 y	22.55 (15.18)	0	46.44
Median income, $	42 243.1 (28 579.6)	0	94 267
Health uninsurance rate	3.231 (5.055)	0	24.08
Logged population size	14.84 (1.042)	11.93	16.74
Average credit card balance, logged	4.827 (2.774)	0	12.38
Average temperature, °F	58.14 (15.11)	14.10	94.80

Note. The sample size was n = 205 352 (9128 unique zip codes). Influenza search data source: Google Flu Trends.²² Default data provided by Equifax Consumer Credit Panel.²⁹ All other measures obtained from American Community Survey,³⁰ Behavioral Risk Factor Surveillance System,³¹ Small Area Health Insurance Estimates,³² and National Climatic Data Center.³⁷

^aF-test from 1-way analysis of variance test.

*P < .05; **P < .01; ***P < .001.