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Table 1 Characteristics of study groups

From: Muscle fatigue in relation to forearm pain and tenderness among professional computer users

Characteristics

Cases

Referents

Gender, n (%)

  

   Female

15 (83%)

17 (85%)

   Male

3 (17%)

3 (15%)

Age, years, mean (min-max)

43.0 (25.5–53.4)

43.8 (28.4–55.2)

Body mass index, kg/m2, mean (min-max)

24.6 (30.7–19.3)

23.6 (34.6–19.5)

Smoking, n (%)

  

   Never smoking

8 (44%)

12 (60%)

   Ex-smoker

7 (39%)

4 (20%)

   Current smoker

3 (17%)

4 (20%)

Leisure time physical activity, n (%)

  

   Less than 2 hours/week

5 (28%)

4 (20%)

   2–4 hours/week

8 (44%)

10 (50%)

   More than 4 hours/week

5 (28%)

6 (20%)

Working conditions1, mean (SD)

  

   Work hours/week

37.0 (5.0)

35.5 (3.3)

   Computer use, hours/week

28.6 (5.7)

23.9 (9.3)

   Mouse use, hours/week

22.0 (11.1)

18.9 (12.8)

Wrist extension force, mean (SD)

  

   Maximal voluntary contraction (Newton)

107.9 (51.5)

110.1 (32.6)

Stimulation current (mA), mean (SD)

40.1 (4.9)

39.6 (3.1)

Twitch force at baseline (Newton), mean (SD)

2.32 (1.63)

2.27 (1.56)

  1. 1Self reported, questionnaire