“Ticking Bomb”: The Impact of Climate Change on the Incidence of Lyme Disease

Table 1

Summary statistics from our sample.

Variable	Obs.	Mean	Std. dev.	Min.	Max.
Incidence of Lyme disease	7,956	41.75	76.24	0	1581.15
Avg. temp.: below 5°C	7,956	0.07	0.25	0	1
Avg. temp.: 5–7°C	7,956	0.16	0.36	0	1
Avg. temp.: 7–9°C	7,956	0.26	0.44	0	1
Avg. temp.: 9–11°C	7,956	0.19	0.39	0	1
Avg. temp.: 11–13°C	7,956	0.18	0.38	0	1
Avg. temp.: 13–15°C	7,956	0.11	0.31	0	1
Avg. temp.: above 15°C	7,956	0.03	0.18	0	1
Total prcp.: below 70 cm	7,956	0.05	0.22	0	1
Total prcp.: 70–120 cm	7,956	0.20	0.40	0	1
Total prcp.: 120–170 cm	7,956	0.27	0.44	0	1
Total prcp.: 170–220 cm	7,956	0.22	0.42	0	1
Total prcp.: 220–270 cm	7,956	0.15	0.35	0	1
Total prcp.: above 270 cm	7,956	0.10	0.31	0	1
Connecticut	7,956	0.01	0.12	0	1
Delaware	7,956	0.01	0.08	0	1
Maine	7,956	0.03	0.18	0	1
Maryland	7,956	0.04	0.19	0	1
Massachusetts	7,956	0.03	0.17	0	1
Minnesota	7,956	0.17	0.37	0	1
New Hampshire	7,956	0.02	0.14	0	1
New Jersey	7,956	0.04	0.20	0	1
New York	7,956	0.12	0.32	0	1
Pennsylvania	7,956	0.12	0.33	0	1
Rhode Island	7,956	0.01	0.09	0	1
Vermont	7,956	0.03	0.17	0	1
Virginia	7,956	0.12	0.33	0	1
West Virginia	7,956	0.10	0.29	0	1
Wisconsin	7,956	0.15	0.35	0	1

Note: this table presents the summary statistics regarding the sample used in our, not or analysis. Our sample contains 7,956 observations from 468 counties over 17 years (2000–2016). Those counties are from the 15 states considered by the CDC as the states with the highest incidence of LD (over 95 percent of all cases in the United States). All variables with the exception of the incidence of LD are indicator variables taking the value of one if the statement on the far left is valid, and zero otherwise. Hence, the means for those indicator variables represent shares of the total number of observations. For example, 26 percent of the county-year observations have annual average temperature between 7 and 9°C, and 17 percent of the county-year observations come from Minnesota.