|
Mail |
Web |
P-value |
| Study 1(2008) |
|
|
|
| Open-ended items |
18.9 |
13.2 |
.000 |
| Screened items |
13.8 |
9.9 |
.009 |
| Demographic items |
4.9 |
2.4 |
.000 |
| Grid items |
1.9 |
2.9 |
.080 |
| Yes/No items |
3.2 |
3.0 |
.773 |
| Study 2(2009) |
|
|
|
| Open-ended items |
19.4 |
14.0 |
.000 |
| Screened items |
10.8 |
9.6 |
.333 |
| Demographic items |
3.6 |
2.7 |
.104 |
| Grid items |
2.0 |
4.6 |
.000 |
| Yes/No items |
3.5 |
4.1 |
.366 |
| Study 3 (2010) |
|
|
|
| Open-ended items |
19.8 |
15.9 |
.000 |
| Screened items |
10.1 |
10.4 |
.720 |
| Demographic items |
4.1 |
2.6 |
.000 |
| Grid items |
2.4 |
2.2 |
.660 |
| Yes/No items |
3.2 |
1.4 |
.000 |