|
Arm 1: Mail + telephone |
Arm 2: Paper invite + email (x2) + mail (x2) |
Arm 3: Paper invite + email (x3) + mail |
Arm 4: Email (x4) + telephone |
Arm 5: Email (x4) + mail + telephone |
Arm 6: Email (x4) + mail (x2) |
Arm 7: Text + Email + text + email + mail (x2) |
Arm 8: Paper invite + text + email mail |
Arm 9: Paper invite (URL only) + email (x2) + mail (x2) |
Overall |
| % Completed by web |
-- |
5.00% |
6.40% |
4.80% |
5.4% (ref) |
5.50% |
7.5%*** |
7.5%** |
5.60% |
5.30% |
| % Completed by mail |
10.3%*** |
10.5%*** |
7.00% |
-- |
7.8% (ref) |
9.8%* |
10.1%*** |
7.00% |
9.8%* |
8.00% |
| % Completed by telephone |
15.10% |
-- |
-- |
18.1%*** |
14.1% (ref) |
-- |
-- |
-- |
-- |
5.30% |
| % Non-respondents |
74.50% |
84.5%*** |
86.6%*** |
77.1%*** |
72.7% (ref) |
84.7%*** |
82.4%*** |
85.6%*** |
84.6%*** |
81.40% |