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Mixed-mode group [na (%)]
|
Online-only group [na (%)]
|
p valueb
|
Within mixed-mode
|
|---|
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Paper-and-pencil [na (%)]
|
Online [na (%)]
|
p valuec
|
|---|
|
N = 1110
|
N = 482
|
N = 620
|
N = 490
|
|---|
|
Sex
| | |
0.71
| | |
<0.001
|
|
Female
|
683 (61.6)
|
292 (60.6)
| |
417 (67.4)
|
266 (54.3)
| |
|
Male
|
426 (38.4)
|
190 (39.4)
| |
202 (32.6)
|
224 (45.7)
| |
|
Age at baseline (March 2014), median (IQR)
|
47 (34–57)
|
50 (39–59)
|
0.009d
|
50 (36–60)
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44 (32–53)
|
<0.001e
|
|
Marital status [na (%)]
| | |
0.04
| | |
0.15
|
|
Married
|
656 (59.4)
|
298 (64.6)
| |
363 (58.7)
|
293 (60.3)
| |
|
Unmarried
|
333 (30.2)
|
110 (23.9)
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181 (29.3)
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152 (31.3)
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|
Other (divorced, widowed)
|
115 (10.4)
|
53 (11.5)
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74 (12.0)
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41 (8.4)
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|
Highest completed educational level
| | |
0.67
| | |
<0.001
|
|
Lower secondary education or apprenticeship
|
336 (30.4)
|
139 (30.1)
| |
229 (36.9)
|
107 (22.0)
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|
Still at upper secondary school
|
25 (2.3)
|
10 (2.2)
| |
21 (3.4)
|
4 (0.8)
| |
|
University entrance qualification (upper secondary education or vocational school)
|
289 (26.1)
|
134 (29.0)
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152 (24.5)
|
137 (28.1)
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|
University degree
|
457 (41.3)
|
179 (38.7)
| |
218 (35.2)
|
239 (49.1)
| |
|
Access to the Internet
| | |
0.008
| | |
<0.001
|
|
Yes
|
1068 (96.8)
|
451 (99.1)
| |
584 (94.5)
|
484 (99.8)
| |
|
No
|
35 (3.2)
|
4 (0.9)
| |
34 (5.5)
|
1 (0.2)
| |
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aDifferences to total N due to missing values, proportions excluding missing values
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bχ2 test comparing mixed-mode design group in total with online-only design group (missing values were not considered)
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cχ2 test comparing paper mode with online mode (missing values were not considered)
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dWilcoxon rank-sum test comparing mixed-mode design group in total with online-only design group
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eWilcoxon rank-sum test comparing paper mode with online mode
