Table 4.
Clinical and laboratory findings and demographic information for 13 patients with retrospectively confirmed* and probable influenza‐associated myositis (IAM) identified only by retrospective review of hospital discharge data – Nebraska, 2006–2007 influenza season
| Parameter | Case classification | |
|---|---|---|
| Retrospectively confirmed* | Probable | |
| Total, n | 4 | 9 |
| Median age, years | 9 | 7 |
| Range, years | 7–14 | 4–12 |
| Sex | ||
| Male, n (%) | 2 (50·0) | 7 (77·8) |
| Female, n (%) | 2 (50·0) | 2 (22·2) |
| Elevated CK, n (%) | 4 (100·0)† | 5 (55·6) |
| Range (U/l) | 869–6053 | 221–15 225 |
| Positive influenza test result, n (%) | 4 (100·0)‡ | 3 (33·3) |
| Type A, n | 1 | 0 |
| Type B, n | 3 | 2 |
| A/B not distinguished, n | 0 | 1 |
| Admission date (range) | 2/14/2007‐3/19/2007 | 2/14/2007‐3/31/2007 |
| Hospitalized, n (%) | 3 (75·0) | 4 (44·4) |
*Eight patients with retrospectively confirmed IAM not included because previously described in Part 1 of investigation.
†Elevated creatinine kinase (CK) required to meet retrospectively confirmed case definition.
‡Positive influenza test result required to meet retrospectively confirmed case definition.