Table 2 The effect of social connectedness across risk groups.

The dependent variable is Social distancing. Restrictions is the number of the five restriction types currently adopted in the county. SCI China and SCI Italy are the SCI values between the county and China and Italy, respectively. Diabetic is the share of county population diagnosed to have diabetes. Population density is the average population density in the county, measured in thousand people per square mile. N cases is the current number of confirmed cases in the county. Columns 1 and 2 exclude all counties with commercial airports handling at least 10,000 commercial services per year, as well as adjacent counties. Heteroscedasticity-consistent SEs, double-clustered by county and day, are shown in parentheses. Significance levels: *0.1, **0.05, and ***0.01.

Ex. airp. & adj. countiesDiabetesPop. density
(1)(2)(3)(4)(5)(6)
Restr. × ln(SCI China)0.0045*** (0.0006)0.0081*** (0.0008)0.0046*** (0.0004)
Restr. × ln(SCI Italy)0.0054*** (0.0006)0.0088*** (0.0008)0.0051*** (0.0004)
Restr. × ln(SCI China) × Diabetic−0.0354*** (0.0057)
Restr. × ln(SCI Italy) × Diabetic−0.0374*** (0.0057)
Restr. × Diabetic0.1588*** (0.0341)0.1782*** (0.0360)
Restr. × ln(SCI China) × Pop. density−0.0012*** (0.0003)
Restr. × ln(SCI Italy) × Pop. density−0.0007*** (0.0003)
Restr. × Pop. density0.0140*** (0.0038)0.0085*** (0.0030)
Restrictions (0–5)−0.0159***
(0.0058)
−0.0200*** (0.0059)−0.0384*** (0.0057)−0.0438*** (0.0061)−0.0236*** (0.0040)−0.0273*** (0.0043)
ln(N cases)0.0138*** (0.0020)0.0117*** (0.0019)0.0110*** (0.0009)0.0101*** (0.0009)0.0123*** (0.0009)0.0114*** (0.0009)
State-Day FEYesYesYesYesYesYes
County FEYesYesYesYesYesYes
N44,40544,405184,766184,766184,766184,766
R20.7130.7140.7570.7570.7560.756