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Table 3 Univariate analysis of case definition B

From: Cumulative keyboard strokes: a possible risk factor for carpal tunnel syndrome

Risk factor

CTS. Case definition B

RR (95 % CI)

 

n/total (%)

 

Sex

  

  Female

156/381 (40.9 %)

3.41

  Male

9/75 (12 %)

(1.83 – 6.37)*

Age

  

  > = 45 years

97/233 (41.6)

1.31

  < 45 years

66/208 (31.7)

(1.02 to 1.68)**

  BMI

  

  > = 25

22/55 (40.0)

1.07

  < 25

134/361(37.1)

(0.75 to 1.52)

Physical activity

  

  Yes

45/144 (31.3)

0.72

  No

89/206 (43.2)

(0.54 to 0.96)***

Smoking

  

  Ever-smoker

77/181 (42.5)

1.22

  Non-smoker

86/247 (34.8)

(0.96 to 1.55)

Rheumatoid Arthritis

  

  Yes

4/8 (50.0)

1.38

  No

163/453 (36.0)

(0.68 to 2.80)

Diabetes Mellitus

  

  Yes

5/11 (45.5)

1.26

  No

162/450 (36.0)

(0.65 to 2.44)

Hypothyroidism

  

  Yes

14/42 (33.3)

0.91

  No

153/419 (36.5)

(0.58 to 1.42)

Hyperthyroidism

  

  Yes

4/14 (28.6)

0.78

  No

163/447 (36.5)

(0.33 to 1.80)

Cumulative keyboard strokes-years

 > =149500000

128/268 (47.8)

2.60

<149500000

27/147 (18.4)

(1.80 to 3.73) *

  1. Risk factors related to CTS (Case definition B).
  2. *P < 0.001;chi-square test.
  3. **P = 0.031;chi-square test.
  4. *** P = 0.002;chi-square test.