Table 2

Statistics of independent variables (see table 3 for air quality variables)

Period or
 date of dataDescriptionMeanSDCounties
1970% Net migration (×10)−41.65183.823145
1970% Black population (×10)93.58149.593146
1970% Other non-white (×10)12.4165.163145
1970% Living in group quarters (×10)26.740.043138
1970% Hispanic (×10)28.45103.343161
1970Median years of school (×10)108.8814.583150
1970% With ≥4 y college (×10)73.4439.613145
1970% Unemployment (×10)45.7324.513145
1970Median income (US$)750719123149
1970% With residential air conditioning (×10)309.11201.813145
1960–69Cigarette sales/capita (by State)119.9923.393143
1970–79Cigarette sales/capita (by State)129.5725.363143
1980–89Cigarette sales/capita (by State)123.4319.463143
1989–90Cigarette sales/capita (by State)106.6221.193143
1990Physicians in office practice/l000 population7.586.533143
1990% Unemployed6.092.653143
1990Median income (US$)2848371663143
1990% Hispanic4.4811.053143
1990% Non-white10.8717.023104
1990% With ≥4 college13.536.593143
1980% With ≥4 y college11.495.473139
1950Infant mortality31.4114.613107
1985% Smokers, adults26.752.693103
1990% Smokers, adults23.962.293103
1985% Obese, adults22.43.593103
1990% Obese, adults30.022.533103
1985% Without exercise, adults34.719.363103
1990% Without exercise, adults31.366.153103
1985% Binge drinkers, adults5.062.13103
1990% Binge drinkers, adults3.440.993103
1990% With hypertension, adults23.272.183103
1990Average green salads/day (adults)0.510.083103
1985% Smokers, elderly13.832.693103
1990% Smokers, elderly12.022.113103
1985% Obese, elderly26.945.83103
1990% Obese, elderly37.33.883103
1985% Without exercise, elderly45.288.693103
1990% Without exercise, elderly43.737.923103
1985% Binge drinkers, elderly2.131.472922
1990% Binge drinkers, elderly1.490.893103
1990% With hypertension, elderly44.73.63103
1990Average green salads/day (elderly)0.550.093103
1970–74Ratio of age ≥15 in population, 1970–74/1960–641.140.223058
1979–81Ratio of age ≥15 in population, 1979–81/1970–741.180.183058
1989–91Ratio of age ≥15 in population, 1989–91/1979–811.060.173063
1995–97Ratio of age ≥15 in population, 1995–97/1989–911.070.093115
1990Log (population density)3.641.633086
1960% Population change7.1138.393097
1960% Non-white10.8216.633108
1960Median income (US$)418913113096
1960% Migration−0.130.193109
1960% Uemployment5.192.523093
1960% With satisfactory housing57.06173107
1960% With air conditioning10.118.863000
AllAverage diurnal swing in barometric pressure0.090.023118
AllAverage wind speed4.220.833118