Table 1.
Sample characteristics of the nationally representative sample across 5 iterations.
| Variable | Withhold information, n (%): yes | Withhold information, n (%): no | Difference (%) | P valuea | |
| Year | .003 | ||||
|
|
2011 | 339 (21.5) | 2357 (19.2) | 2.29 |
|
|
|
2012 | 293 (21.7) | 2018 (19.1) | 2.62 |
|
|
|
2014 | 332 (23.2) | 2039 (18.6) | 4.61 |
|
|
|
2017 | 187 (17.3) | 2002 (21.4) | −4.14 |
|
|
|
2018 | 199 (16.3) | 2188 (21.7) | −5.38 |
|
| Gender | .14 | ||||
|
|
Male | 500 (48.9) | 4121 (45.8) | 3.16 |
|
|
|
Female | 850 (51.1) | 6483 (54.2) | −3.16 |
|
| Education | .46 | ||||
|
|
Less than high school | 79 (7.9) | 691 (8.4) | −0.48 |
|
|
|
12 years or completed high school | 182 (17.8) | 1936 (19.5) | −1.67 |
|
|
|
Some college | 451 (38.8) | 3155 (35.5) | 3.27 |
|
|
|
College graduate or higher | 638 (35.5) | 4822 (36.7) | −1.12 |
|
| Age group | <.001 | ||||
|
|
18-24 | 36 (4.8) | 294 (10.8) | −5.97 |
|
|
|
25-44 | 462 (46.1) | 2521 (32.3) | 13.82 |
|
|
|
45-64 | 652 (41.0) | 4506 (38.4) | 2.6 |
|
|
|
65+ | 200 (8.1) | 3283 (18.5) | −10.45 |
|
| Occupation | <.001 | ||||
|
|
Employed | 838 (68.3) | 5476 (57.5) | 10.79 |
|
|
|
Unemployed | 91 (7.0) | 444 (5.5) | 1.53 |
|
|
|
Retired | 190 (7.8) | 3163 (18.5) | −10.74 |
|
|
|
Disabled | 121 (7.1) | 670 (5.4) | 1.76 |
|
|
|
Other | 110 (9.7) | 851 (13.1) | −3.34 |
|
aP values are calculated from chi-square tests to show association between characteristics variables and WIB.