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Table 1 Background characteristics

From: Orthostatic responses in adolescent chronic fatigue syndrome: contributions from expectancies as well as gravity

 

CFS patients (n = 30)

Healthy controls (n = 39)

p-value

Sex - no. (%)

   

  Male

9 (30)

11 (28)

0.871

  Female

21 (70)

28 (72)

 

Ethnicity – no. (%)

   

  Scandinavian

30 (100)

37 (95)

0.501

  Not scandinavian

0 (0)

2 (5)

 

Age - years, mean (SD)

15.2 (1.7)

15.2 (1.6)

0.889

BMI - kg/m2, mean (SD)

21.8 (4.5)

20.3 (2.9)

0.116

Alcoholic beverages - no. (%)

   

  Never

24 (83)

28 (78)

0.618

  Occationally

5 (17)

8 (22)

 

Tobacco products - no. (%)

   

  Never

24 (86)

29 (78)

0.450

  Occationally

4 (14)

8 (22)

 

Narcotics/illigal drugs - no. (%)

   

  Never

27 (100)

34 (92)

0.257

  Occationally

0 (0)

3 (8)

 

School absenteism - %, mean (SD)

64 (30)

2 (7)

<0.001

Adheres to Fukuda-criteria - no. (%)

   

  No

9 (31)

n.a.

n.a.

  Yes

20 (69)

  

Disease duration - months, median (range)

19 (56)

n.a.

n.a.

  1. P-values are based on Chi-square test, Fisher's exact test, Student t-test or Mann-Whitney's test, as appropriate. SD = standard deviation, IQR = interquartile range, n.a. = not applicable, BMI = body mass index, Fukuda-criteria = The CFS diagnostic criteria from the International Chronic Fatigue Syndrome Study Group [1].