|
Predictor variable
| |
Lost to follow-up n = 50
|
Not lost to follow-up n = 359
|
Odds ratio (95% confidence interval)
|
Area under ROC curve, or sensitivity and specificity
|
|---|
|
Hypothesized predictors
| | | | | |
|
Number of absencesa
|
Median (25%, 75%)
|
2.0 (0, 5)
|
0 (0, 1)
|
1.78 (1.49-2.12)
|
0.723
|
| |
95% CI
|
1 to 4
|
0 to 1
| | |
|
Contactb
|
Yes
|
18
|
188
|
0.51 (0.28-0.95)
|
0.64, 0.52
|
| |
No
|
32
|
171
| | |
|
Other analyses
c
| | | | | |
|
Aged
|
Mean ± SD
|
42.5 ± 14.1
|
48.1 ± 14.0
|
0.97 (0.95-0.99)
|
0.623
|
| |
95% CI
|
38.6 to 46.4
|
46.6 to 49.5
| | |
|
Sex
|
Female
|
40
|
285
|
1.04 (0.50-2.17)
|
0.20, 0.79
|
| |
Male
|
10
|
74
| | |
|
Schoolinge
|
High
|
23
|
185
|
0.80 (0.44-1.44)
|
0.54, 0.52
|
| |
Low
|
27
|
173
| | |
|
Marital statusf
|
Together
|
21
|
194
|
0.61 (0.34-1.11)
|
0.58, 0.54
|
| |
Not together
|
29
|
164
| | |
|
Self-efficacyg
|
Mean ± SD
|
32.2 ± 12.5
|
32.2 ± 12.2
|
1.00 (0.98-1.02)
|
0.502
|
| |
95% CI
|
28.7 to 35.7
|
31.0 to 33.5
| | |
|
> 3 diagnoses
|
With
|
1
|
24
|
0.29 (0.04-2.15)
|
0.98, 0.07
|
| |
Without
|
49
|
335
| | |
|
Allergic disease
|
With
|
15
|
90
|
1.28 (0.67-2.45)
|
0.30, 0.75
|
| |
Without
|
35
|
269
| | |
|
Connective tissue disease
|
With
|
3
|
64
|
0.29 (0.09-0.98)
|
0.94, 0.18
|
| |
Without
|
47
|
295
| | |
|
Diabetes
|
With
|
6
|
59
|
0.69 (0.28-1.70)
|
0.88, 0.17
|
| |
Without
|
44
|
300
| | |
|
Vascular disease
|
With
|
10
|
55
|
1.38 (0.65-2.93)
|
0.20, 0.85
|
| |
Without
|
40
|
304
| | |
|
Rheumatic disease
|
With
|
4
|
43
|
0.64 (0.22-1.86)
|
0.92, 0.12
|
| |
Without
|
46
|
316
| | |
|
Fibromyalgia syndrome
|
With
|
5
|
27
|
1.37 (0.50-3.73)
|
0.10, 0.92
|
| |
Without
|
45
|
332
| | |
|
Cardiovascular disease
|
With
|
0
|
24
|
0h
|
1.00, 0.07
|
| |
Without
|
50
|
335
| | |
|
Cancer
|
With
|
2
|
21
|
0.67 (0.15-2.95)
|
0.96, 0.06
|
| |
Without
|
48
|
338
| | |
|
Asthma
|
With
|
3
|
18
|
1.21 (0.34-4.26)
|
0.06, 0.95
|
| |
Without
|
47
|
341
| | |
|
Depression
|
With
|
4
|
13
|
2.31 (0.72-7.40)
|
0.08, 0.96
|
| |
Without
|
46
|
346
| | |
|
Pulmonary disease
|
With
|
3
|
10
|
2.23 (0.59-8.39)
|
0.06, 0.97
|
| |
Without
|
47
|
349
| | |
- For the number of absences, the table shows medians, 25th & 75th percentiles, and 95% confidence intervals.
- For the other two continuous variables, the table shows means ± SDs, 95% confidence intervals, and areas under ROC curves.
- For each categorical variable, the table shows numbers of people in each category, odds ratio and its 95% confidence interval, sensitivity, and specificity.
-
a Number of absences from program sessions; minimum = 0, maximum = 6. Odds ratio from simple logistic regression.
-
b No: did not have in-person contact with one of the researchers; yes: did have contact, once, at the time baseline data were collected.
-
c Analyses of predictors studied previously or suggested during peer review.
-
d Age in years. Odds ratio from simple logistic regression.
-
e Low: high school or less; high: college or more.
-
f Together: living together; not: all others
-
g Score on a 0-to-60 scale measuring self-efficacy to manage symptoms; odds ratio from simple logistic regression.
-
h Because no people with cardiovascular disease were completely lost to follow-up, there was complete separation in the "complete loss to follow-up" category. For a conservatively-biased estimate, changing the 0 to 1 and the 50 to 49 would yield an odds ratio of 0.29 (0.04-2.15).
