TABLE. Demographic characteristics and outcome indicators for tickborne rickettsial disease cases by eschar status — United States case report forms, 2010–2016.
| Characteristic | No. (%) |
Chi-squared p-value* | ||
|---|---|---|---|---|
| Eschar reported (n = 484) | No eschar reported (n = 7,866) | Missing information about eschars (n = 35,749) | ||
|
Case classification
|
p<0.001 |
|||
| Confirmed |
42 (8.7) |
1,093 (13.9) |
11,145 (31.2) |
|
| Probable |
442 (91.3) |
6,773 (86.1) |
24,604 (68.8) |
|
|
Sex
|
p<0.001 |
|||
| Male |
290 (59.9) |
5,037 (64.0) |
21,887 (61.2) |
|
| Female |
189 (39.0) |
2,780 (35.3) |
13,166 (36.8) |
|
| Unknown |
5 (1.0) |
49 (0.6) |
696 (2.0) |
|
|
Race
|
p<0.001 |
|||
| White |
331 (68.4) |
5,896 (75.0) |
23,923 (66.9) |
|
| Black |
10 (2.1) |
143 (1.8) |
670 (1.9) |
|
| American Indian/Alaska Native |
8 (1.7) |
40 (0.5) |
776 (2.2) |
|
| Asian/Pacific Islander |
2 (0.4) |
37 (0.5) |
186 (0.5) |
|
| Not specified/Unknown |
133 (27.5) |
1,750 (22.3) |
10,194 (28.5) |
|
|
Ethnicity
|
p<0.001 |
|||
| Hispanic |
10 (2.1) |
203 (2.6) |
677 (1.9) |
|
| Non-Hispanic |
402 (83.1) |
6,267 (79.7) |
21,668 (60.6) |
|
| Unknown |
72 (14.9) |
1,396 (17.8) |
13,404 (37.5) |
|
|
Age group (yrs)
|
p<0.001 |
|||
| <10 |
11 (2.3) |
183 (2.5) |
789 (3.1) |
|
| 10–19 |
14 (2.9) |
387 (5.3) |
1,350 (5.3) |
|
| 20–29 |
37 (7.6) |
546 (7.4) |
1,705 (6.7) |
|
| 30–39 |
45 (9.3) |
827 (11.2) |
2,408 (9.5) |
|
| 40–49 |
71 (14.7) |
1,128 (15.3) |
3,448 (13.5) |
|
| 50–59 |
99 (20.5) |
1,547 (21.0) |
5,269 (20.6) |
|
| 60–69 |
91 (18.8) |
1,526 (20.7) |
5,569 (21.9) |
|
| ≥70 |
79 (16.3) |
1,220 (16.6) |
4,960 (19.5) |
|
| Unknown |
37 (7.6) |
502 (6.4) |
10,261 (28.7) |
|
|
U.S. Census region of residence†
|
p<0.001 |
|||
| Northeast |
24 (5.0) |
608 (7.7) |
10,576 (29.7) |
|
| Midwest |
71 (14.7) |
2,385 (30.4) |
11,881 (33.3) |
|
| South |
361 (74.6) |
4,738 (60.3) |
12,888 (36.1) |
|
| West |
28 (5.8) |
125 (1.6) |
329 (0.9) |
|
|
Travel
|
p<0.001 |
|||
| Yes |
110 (22.7) |
1,403 (17.8) |
3,730 (10.4) |
|
| No |
162 (33.5) |
1,678 (21.3) |
6,562 (18.4) |
|
| Unknown |
212 (43.8) |
4,785 (60.8) |
25,457 (71.2) |
|
|
Immunosuppressive condition
|
p<0.001 |
|||
| Yes |
62 (12.8) |
765 (9.7) |
2,109 (5.9) |
|
| No |
318 (65.7) |
5,349 (68.0) |
14,474 (40.5) |
|
| Unknown |
104 (21.5) |
1,752 (22.3) |
19,166 (53.6) |
|
|
Hospitalization status
|
p<0.001 |
|||
| Hospitalized |
90 (18.6) |
2,120 (27.0) |
9,104 (25.5) |
|
| Not hospitalized |
368 (76.0) |
5,559 (70.7) |
17,529 (49.0) |
|
| Unknown |
26 (5.4) |
187 (2.4) |
9,116 (25.5) |
|
|
Outcome
|
p<0.001 | |||
| Died |
1 (0.2) |
21 (0.3) |
124 (0.4) |
|
| Survived |
434 (89.7) |
7,351 (93.5) |
26,895 (75.2) |
|
| Unknown | 49 (10.1) | 494 (6.3) | 8,730 (24.4) | |
* Statistically significant difference (p<0.05) between eschar reporting categories using Chi-squared analysis.
† Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont. Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin. South: Alabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, and West Virginia. West: Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming.