Volume 28, Number 2—February 2022
CME ACTIVITY - Research
Epidemiology of Hospitalized Patients with Babesiosis, United States, 2010–2016
, Jonathan R. Day, Peter J. Krause, Anne Kjemtrup, Sheila F. O’Brien, Aaron A.R. Tobian, and Ruchika Goel
Table 1
Characteristics of hospitalized patients for whom babesiosis was listed as an admitting diagnoses, United States, 2010–2016*
| Characteristic | All data | ICD-9 data, 2010–2015q3† | ICD-10 data, 2015q4–2016† |
|---|---|---|---|
| Babesiosis as 1 of all diagnoses | 7,818 (100) | 6,368 (100) | 1,450 (100) |
| Primary diagnosis babesiosis |
4,648 (59.5) |
3,838 (60.2) |
810 (55.9) |
| Demographic data | |||
| Age, y | |||
| 0–1 | 30 (0.4) | 30 (0.5) | NA |
| 18–44 | 831 (10.6) | 641 (10.1) | 190 (13.1) |
| 45–64 | 2583 (33.0) | 2178 (34.2) | 405 (27.9) |
| >65 | 4374 (55.9) | 3519 (55.3) | 855 (59.0) |
| Mean (SD) | 64.7 (16.0) | 64.5 (16) | 65.7 (16.4) |
| Median (IQR) | 67 (55–77) | 66 (55–76) | 68.5 (55–78) |
| Sex | |||
| M | 5,001 (64.0) | 4,081 (64.1) | 920 (63.4) |
| F | 2,817 (36.0) | 2,287 (35.9) | 530 (36.6) |
| Race/ethnicity | |||
| White | 6,024 (80.1) | 4,899 (80.2) | 1,125 (79.8) |
| African American | 245 (3.3) | 180 (3.0) | 65 (4.6) |
| Hispanic | 503 (6.7) | 403 (6.6) | 100 (7.1) |
| Asian/Pacific Islander | 240 (3.2) | 170 (2.8) | 70 (5.0) |
| Other |
509 (6.7) |
459 (7.5) |
50 (3.5) |
| Hospital and temporal | |||
| Admission month§ | d | ||
| January | 25 (0.8) | 15 (0.8) | 10 (0.7) |
| February | 60 (1.8) | 25 (1.4) | 35 (2.4) |
| March | 35 (1.1) | 25 (1.4) | 10 (0.7) |
| April | 51 (1.6) | 41 (2.3) | 10 (0.7) |
| May | 109 (3.3) | 64 (3.5) | 45 (3.1) |
| June | 371 (11.4) | 171 (9.4) | 200 (13.9) |
| July | 1,192 (36.5) | 787 (43.1) | 405 (28.1) |
| August | 762 (23.3) | 437 (24.0) | 325 (22.6) |
| September | 269 (8.2) | 179 (9.8) | 90 (6.3) |
| October | 80 (2.5) | 20 (1.1) | 60 (4.2) |
| November | 181 (5.5) | 46 (2.5) | 135 (9.4) |
| December | 130 (4.0) | 15 (0.8) | 115 (8) |
| Elective vs. nonelective admissions | |||
| Nonelective | 7,452 (95.4) | 6,067 (95.3) | 1,385 (95.8) |
| Elective | 356 (4.6) | 296 (4.7) | 60 (4.2) |
| Region of hospital¶ | |||
| Northeast | 6,140 (86.0) | 4,915 (86.4) | 1,225 (84.5) |
| Midwest | 476 (6.7) | 371 (6.5) | 105 (7.2) |
| South | 375 (5.3) | 295 (5.2) | 80 (5.5) |
| West | 150 (2.1) | 110 (1.9) | 40 (2.8) |
| Division subset of hospitals# | |||
| New England: ME, NH, VT, MA, RI, CT | 1,150 (44.1) | 480 (41.4) | 670 (46.2) |
| Mid-Atlantic: NY, PA, NJ | 1,115 (42.7) | 560 (48.3) | 555 (38.3) |
| East North Central: WI, MI, IL, IN, OH | 100 (3.8) | 40 (3.4) | 60 (4.1) |
| West North Central: MO, ND, SE, NE, KS, MN, IA | 65 (2.5) | 20 (1.7) | 45 (3.1) |
| South Atlantic: DE, MD, DC, VA, WV, NC, SC, GA, FL | 90 (3.4) | 35 (3.0) | 55 (3.8) |
| East South Central: KY, TN, MS, AL | 10 (0.4) | ** | 10 (0.7) |
| West South Central: OK, TX, AR, LA | 20 (0.8) | ** | 15 (1.0) |
| Mountain: ID, MT, WY, NV, UT, CO, AZ, NM | ** | ** | ¶ |
| Pacific: AK, WA, OR, CA, HI | 55 (2.1) | 20 (1.7) | 35 (2.4) |
| Hospital bed size** | |||
| Small | 2,159 (30.2) | 1,659 (29.1) | 500 (34.5) |
| Medium | 2,084 (29.2) | 1,609 (28.3) | 475 (32.8) |
| Large | 2,898 (40.6) | 2,423 (42.6) | 475 (32.8) |
| Hospital teaching status** | |||
| Rural | 612 (8.6) | 527 (9.3) | 85 (5.9) |
| Urban nonteaching | 2,488 (34.8) | 2,093 (36.8) | 395 (27.2) |
| Urban teaching | 4,041 (56.6) | 3,071 (54.0) | 970 (66.9) |
*Values are no. (%) except as indicated. Data are from the NIS, which offers a representative sampling of US-based hospitals. Weighted national estimates are based on data that were collected by individual states and provided to AHRQ. Total number of weighted discharges in the US based on HCUP NIS: 37,352,013 (2010); 36,962,415 (2011); 36,484,846 (2012); 35,597,792 (2013); 35,358,818 (2014); 35,769,942 (2015); 35,675,421 (2016). In 2012, the NIS was redesigned to optimize national estimates. The nationwide statistics in HCUPnet for the years before 2012 were regenerated using new trend weights to permit longitudinal analysis. The regenerated data were posted to HCUPnet on July 2, 2014. HCUP notes that the statistics for the years before 2012 that are currently on HCUPnet will differ slightly from statistics obtained before that date. Information about the NIS redesign and trend weights is available at https://hcupnet.ahrq.gov. For more information about HCUP data. see http://www.hcup-us.ahrq.gov. AHRQ, Agency for Healthcare Research and Quality; HCUP, Healthcare Cost and Utilization Project; ICD-9, International Classification of Diseases, Ninth Revision; ICD-10, International Classification of Diseases, Tenth Revision; NA, not available; NIS, National Inpatient Sample. †Because of the transition from ICD-9 to ICD-10 in October 2015, the data represent 2 time periods. ICD-9 data reflect 2010 through the third quarter of 2015 (2015q3) and ICD-10 data represent the fourth quarter of 2015 (2015q4) through 2016. §Data for 2011–2014 not available. ¶2010 data not available. #Data available only for 2015 and 2016. **Statistics based on estimates with a relative SE (SE/weighted estimate) >0.30 or a total cell count <10 in the NIS are not reliable. These statistics are suppressed per HCUP policies.