Table 4

Patient characteristics of participants and non-participants

all participants in cohort

participants in sample

non-participants in sample

comparison# of participation rates


N

n

(%)

N

n

(%)

N

n

(%)

OR

(95% CI)


gender (nwomen)

1045

494

(47%)

130

64

(49%)

180

83

(46%)

1.20

(0.78–1.85)

age (n>35 years)

1045

741

(71%)

130

94

(72%)

180

109

(61%)

1.79

(1.12–2.86)*

in men

551

380

(69%)

66

46

(69%)

97

50

(52%)

2.08

(1.11–3.93)*

in women

494

361

(73%)

64

48

(78%)

83

59

(71%)

1.41

(0.69–2.90)

in traumatic

197

134

(68%)

16

11

(73%)

34

17

(50%)

2.60

(0.80–8.98)

in non-traumatic

848

607

(72%)

114

83

(73%)

146

92

(63%)

1.63

(0.98–2.72)

trauma$ (npositive)

1045

197

(19%)

130

16

(12%)

180

34

(19%)

0.59

(0.32–1.09)

in men

551

109

(20%)

66

9

(14%)

97

20

(21%)

0.60

(0.26–1.38)

in women

494

88

(18%)

64

7

(11%)

83

14

(17%)

0.58

(0.23–1.47)

ICPC codes

L15: unspecified

519

(51%)

69

(53%)

82

(46%)

L78: acute distortion

107

(10%)

7

(5%)

20

(11%)

L90: osteoarthritis

77

(7%)

9

(7%)

28

(16%)

L94.2: Osgood-Schlatter

10

(1%)

1

(1%)

0 0%

L96: acute meniscus/ligament ruptures

87

(8%)

12

(9%)

14

(8%)

L97: chronic internal trauma

245

(23%)

32

(25%)

36

(20%)


$ patient described onset of complaints in questionnaire as immediate, due to impact or twisting, maximally 1 year before consultation

# comparing participation rates of age groups and traumatic injuries in sample

* p-value < 0.05

N total number of patients

n number of patients in a subset

Heintjes et al. BMC Musculoskeletal Disorders 2005 6:45   doi:10.1186/1471-2474-6-45

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