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Table 1 main features of patients with BACM

From: Management and outcome of benign acute childhood myositis in pediatric emergency department

Total BACM episodes, n 113
Patients with at least one BACM, n 102
 - Patients with single BACM, n, % 92 (90%)
 - Patients with recurrent BACM, n, % 10 (10%)
Sex: male, n (%), female, n (%) 74 (73%), 28 (27%)
Age: median, range 6,0 years, 2,0–13,2 years
Fever: n (%) 96 (85%)
Muscle pain: n (%) 103 (91%)
Gait abnormalities: n (%) 87 (77%)
 - Refuse to bear weight 17 (15%)
 - Walking on toes 12 (11%)
 - Wide base gait 9 (8%)
 - Motor embarrassment/difficulties 49 (43%)
Creatine kinase: median (range) 1413 IU/L (257–12,858 IU/L)
White cell count: median (range) 4650/μL (1950–11,980)
 - Neutrophils 2005/μL (372–8400)
 - Lymphocyte 1904/μL (340–6800)
C reactive protein: median (range) 0 mg/dl (0–2,65)
Viral studies: n (%) 74 (65%)
Viral studies positive: n (%) 51 (45%)
 - Influenza B 22 (19%)
 - Influenza A 15 (13%)
 - Coxsackievirus 7 (6%)
 - Adenovirus 4 (4%)
 - Echovirus 2 (2%)
 - Mycoplasma 1 (1%)
Hospitalization: n (%) 96 (85%)
Median length of stay: days, range 4 days, 1–10
Myoglobinuria/Acute renal failure 0
Return ED visit 0