Table 3.

Impact of H1N1 Prevalence on Intestinal Infections by Age Groups: 2008 vs 2009.

Age Group:	(1) All	(2) 0–4	(3) 5–14	(4) 15–44	(5) 45+
Panel A. The Dependent Variable Captures Diarrhea-related Hospitalizationsa
H1N1b	−0.064	−0.105	0.026	0.000	0.015
	(0.053)	(0.040)	(0.010)	(0.009)	(0.007)
p-valuec	0.141	0.060	0.597	0.994	0.266
R2	0.442	0.588	0.188	0.002	0.115
Mean $\left({\displaystyle \overline{Y}}\right)$	2,270	1,117	359	84	444
Observations	64	64	64	64	64
Panel B. The Dependent Variable Captures Diarrhea Cases (Morbidity)d
H1N1b	1.253	−1.737	0.847	1.395	0.745
	(2.011)	(0.786)	(0.456)	(0.741)	(0.495)
p-valuec	0.565	0.051	0.246	0.220	0.256
R2	0.026	0.501	0.345	0.308	0.182
Mean $\left({\displaystyle \overline{Y}}\right)$	167,612	49,977	32,005	51,908	33,605
Observations	64	64	64	64	64

Notes: All regressions include time and state fixed effects. The period of analysis is 2008–2009. Mean $\left({\displaystyle \overline{Y}}\right)$ denotes the mean of the dependent variable for each specification.

^aThe dependent variable is the annual number of hospital discharges where the primary diagnosis was the International Classification of Diseases (ICD-10) codes A00-A09X for all males and females in respective age group.

^bH1N1 is equal to the number of H1N1 cases in a given state in 2009 and zero in 2008.

^cThe p-value denotes the p-value of wild bootstrapped standard errors for each specification to correct for small number (32) of clusters.

^dFor Panel B the outcome is number of diarrhea cases (morbidity) for all males and females in respective age group.