| |
Mean
|
sd
|
ßa,b (95% CI)
|
|---|
|
Envelope color
|
|
White
|
7.5
|
3.1
|
0
|
|
Grey
|
7.4
|
3.2
|
0.65 (− 0.38, 1.68)
|
|
Sexc
|
|
Female
|
7.4
|
3.0
|
0
|
|
Male
|
7.4
|
3.3
|
0.06 (− 0.92, 1.04)
|
|
Nationalityc
|
|
Non-German
|
8.2
|
3.2
|
0
|
|
German
|
7.4
|
3.2
|
− 0.56 (− 2.59, 1.47)
|
|
Age
|
|
20–29
|
7.4
|
2.9
|
− 0.53 (− 2.45, 1.39)
|
|
30–39
|
6.8
|
2.8
|
− 0.66 (− 3.4, 2.08)
|
|
40–49
|
7.5
|
2.8
|
0
|
|
50–59
|
8.0
|
3.6
|
0.53 (− 0.71, 1.77)
|
|
60–69
|
6.8
|
3.1
|
− 0.74 (− 2.03, 0.54)
|
|
N
|
171
| | |
- CI confidence interval
- aIncludes subjects who replied by letter, phone call, e-mail or visited the study center in person
- bAdjusted for pre-trial likelihood of active responses to invitation letter stratified by weekdays
- cInformation provided by Bremen’s resident registration office
