Table 2 Representativeness of participant sample (Tailoring study)
From: Practical application of opt-out recruitment methods in two health services research studies
| Â | Veterans eligible to receive opt-out letter | Veterans mailed opt-out letter | Veterans who received opt-out letter | Veterans who participated | p-value (eligible vs. participated)* | p-value (mailed opt-out vs. participated) | p-value (received opt-out vs. participated) | |
|---|---|---|---|---|---|---|---|---|
N | 70119 | 3703 | 3533 | 762 | Â | Â | Â | |
| Â | Â | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | p | p | p |
Age | (Years) | 51.6 (13.8) | 50.8 (13.8) | 51.0 (13.8) | 51.6 (12.5) | .35 | .48 | .70 |
| Â | Â | N (%) | N (%) | N (%) | N (%) | p | p | p |
Gender | Male | 62280 (88.8) | 2947 (79.6) | 2806 (79.4) | 574 (75.3) | <.0001 | <.01 | .01 |
Female | 7839 (11.2) | 756 (20.4) | 727 (20.6) | 188 (24.7) | Â | Â | Â | |
Race | Native American | 1488 (2.1) | 66 (1.8) | 64 (1.8) | 13 (1.7) | .08 | .82 | .86 |
Asian/Pacific Islander | 833 (1.2) | 42 (1.1) | 40 (1.1) | 8 (1.1) | Â | Â | Â | |
Black | 12170 (17.4) | 474 (12.8) | 451 (12.8) | 105 (13.8) | Â | Â | Â | |
White | 50271 (71.7) | 2811 (75.9) | 2688 (76.1) | 582 (76.4) | Â | Â | Â | |
Unknown | 5357 (7.6) | 310 (8.4) | 290 (8.2) | 54 (7.1) | Â | Â | Â | |
Ethnicity | Hispanic | n/a | n/a | n/a | 46 (6.0) | n/a | n/a | n/a |
Not Hispanic | n/a | n/a | n/a | 712 (93.4) | Â | Â | Â | |
Unknown | n/a | n/a | n/a | 4 (0.5) | Â | Â | Â | |
MH Use | MH Use | 46672 (66.6) | 2498 (67.5) | 2375 (67.2) | 532 (69.8) | .06 | .20 | .17 |
No MH Use | 23447 (33.4) | 1205 (32.5) | 1158 (32.8) | 230 (30.2) | Â | Â | Â | |
Rural/Urban | Rural | 20426 (29.1) | 1070 (28.9) | 1023 (29.0) | 230 (30.2) | .39 | .45 | .46 |
Urban | 49279 (70.3) | 2611 (70.5) | 2489 (70.5) | 525 (68.9) | Â | Â | Â | |
Missing | 414 (0.6) | 22 (0.6) | 21 (0.6) | 7 (0.9) | Â | Â | Â | |