Table 5. Acute respiratory illness hospitalizations for patientsby age who had immunosuppressive conditions in MarketScan database, United States, July 2012–August 2017*.
| Characteristic | All ARI hospitalizations |
ARI hospitalizations in immunosuppressed persons† |
ARI in immunosuppressed versus nonimmunosuppressed persons, relative rate/1,000 person-years (95% CI)‡ | |||
|---|---|---|---|---|---|---|
| No. | Rate/1,000 person-years | No. (%) | Rate/1,000 person-years | |||
| Year round, August–July | ||||||
| Age, y | ||||||
| All | 542,105 | 4.7 | 173,665 (32.0) | 25.5 | 4.2 (4.0–4.3) | |
| >1–8 | 50,170 | 4.5 | 6,638 (13.2) | 41.2 | 8.1 (7.8–8.4) | |
| 9–17 | 14,388 | 1.1 | 2,839 (19.7) | 6.0 | 5.0 (4.7–5.4) | |
| 18–49 | 88,051 | 1.7 | 29,136 (33.1) | 11.3 | 6.7 (6.5–6.9) | |
| 50–64 | 142,631 | 5.0 | 57,512 (40.3) | 23.3 | 4.8 (4.6–4.9) | |
|
>65 |
246,865 |
26.2 |
|
77,540 31.4) |
68.3 |
2.1 (2.0–2.1) |
| Peak influenza season, December–March | ||||||
| Age, y | ||||||
| All | 240,856 | 6.3 | 77,308 (32.1) | 34.0 | 4.3 (4.2–4.5) | |
| <1–8 | 27,084 | 7.3 | 3,408 (12.6) | 63.4 | 7.9 (7.5–8.3) | |
| 9–17 | 5,838 | 1.3 | 1,258 (21.5) | 7.9 | 5.7 (5.1–6.4) | |
| 18–49 | 37,190 | 2.1 | 12,786 (34.4) | 14.8 | 6.8 (6.8–7.4) | |
| 50–64 | 61,316 | 6.4 | 25,491 (41.6) | 31.0 | 5.0 (4.8–5.2) | |
| >65 | 109,428 | 34.9 | 34,365 (31.4) | 90.8 | 2.1 (2.0–2.2) | |
*ARI, acute respiratory illness. †See Figure 1. Immunosuppressive denotes patients had International Classification of Diseases codes for either 3 immunosuppressive conditions OR 3 conditions plus immunosuppressive pharmacologic treatment (chemotherapeutic agents or immune modulators or systemic corticosteroids >14 d). ‡Relative rates of ARI were adjusted for year of hospitalization and sex.