|
Factor
|
n
|
Unadjusted OR of receiving invasive test (CI)*
|
Adjusted OR of receiving invasive test (CI)+
|
P
$
|
|---|
|
Patient characteristics
| | | | |
|
Age
| | | | |
|
35–65
|
52
|
0.8 (0.3–1.7)
|
1.5 (0.5–4.3)
|
0.38
|
|
> 65
|
60
|
1
|
1
| |
|
Sex
| | | | |
|
Male
|
82
|
2.9 (1.2–7.2)
|
0.5 (0.1–3.8)
|
0.57
|
|
Female
|
30
|
1
|
1
| |
|
Referral pattern
| | | | |
|
Specialist
|
94
|
4.1 (1.2–13.5)
|
6.6 (1.4–30.3)
|
0.01
|
|
GP
|
18
|
1
|
1
| |
|
History of smoking
| | | | |
|
Current or past smoker
|
79
|
19.2 (5.3–68.8)
|
32.9 (4.3–247.7)
|
<0.01
|
|
Never smoked
|
33
|
1
|
1
| |
|
Nodule characteristics
| | | | |
|
Calcification within the nodule
| | | | |
|
Yes
|
12
|
0.1 (0.1–0.8)
|
0.5 (0.1–4.2)
|
0.54
|
|
No
|
100
|
1
|
1
| |
|
Spiculated nodule
| | | | |
|
Yes
|
32
|
4.7 (1.8–11.8)
|
5.7 (1.6–19.5)
|
<0.01
|
|
No
|
80
|
1
|
1
| |
|
Mediastinal involvement
| | | | |
|
Yes
|
31
|
1.9 (0.8–4.6)
|
1.4 (0.4–4.3)
|
0.49
|
|
No
|
81
|
1
|
1
| |
- GP = general practitioner
- *In univariate logistic regression models
- +In multivariate logistic regression model
-
$p values for the factors are the Wald statistics for the estimates in the model
