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Table 1 Demographic and clinical characteristics and initial laboratory test results from patients in town of Lianzhou presenting with unexplained myalgia in 2009 *

From: A past Haff disease outbreak associated with eating freshwater pomfret in South China

Variable

Total (n = 54)

Male (n = 36)

Female (n = 18)

P-value*

Age, years

   

0.291

Mean

42

41

45

 

Median

43

42

43

 

Range

4-74

4-71

22-74

 

Clinical characteristics, n(%)

Weakness

45 (83.3)

30 (83.3)

15 (83.3)

1.000

Myalgia

41 (75.9)

28 (77.8)

13 (72.2)

0.740

Nausea

34 (63.0)

23 (63.9)

11 (61.1)

0.842

Abdominal pain

34 (63.0)

24 (66.7)

10 (55.6)

0.425

Laboratory test values, mean ± SD

Serological test

α-HBDH, U/L

357.9 ± 309.6

394.1 ± 342.4

245.7 ± 129.1

0.268

CK, U/L

2812.3 ± 3350.8

3239.5 ± 3674.8

1488.1 ± 1520.0

0.213

AST, U/L

166.7 ± 227.9

193.8 ± 255.4

82.6 ± 55.6

0.514

CK-MB, U/L

99.2 ± 127.0

114.5 ± 141.0

51.9 ± 45.9

0.208

CK-MB Fraction,%

6.0 ± 5.4

5.8 ± 5.1

6.8 ± 6.2

0.632

LDH,U/L

428.4 ± 362.0

473.7 ± 400.2

288.1 ± 137.9

0.302

TBA, μmol/L

25.5 ± 7.00

23.8 ± 6.9

30.6 ± 4.1

0.006

ALT, U/L

64.1 ± 65.8

67.2 ± 72.5

54.6 ± 39.3

0.927

Renal function test

Cr, μmol/L

74.9 ± 15.3

77.0 ± 15.1

67.5 ± 14.9

0.133

BUN, mmol/L

5.3 ± 1.5

5.5 ± 1.3

4.4 ± 1.6

0.048

Urinalysis

SG

1.02 ± 0.007

1.021 ± 0.007

1.020 ± 0.008

0.830

  1. *: Data of demographic and clinical characteristics are for all patients identified; data of laboratory test values are for patients who presented to the county level hospital and were taken blood samples for tests.
  2. *: Fisher’s Exact Test and Pearson Chi-Square Test were used for proportions, the Mann–Whitney U test was used for gender distribution.