Table 2.
Unadjusted and Adjusted odds of response by patient characteristics and incentive condition
| First Mailing/Reminder postcard | Final Response | |||||||
|---|---|---|---|---|---|---|---|---|
| $2 | $5 | Unadjusted p-value* |
Adjusted odds of responding with $5 incentive vs. $2 incentive ** | $2 | $5 | p-value* | Adjusted odds of responding with $5 incentive vs. $2 incentive** | |
| Overall Response Rate (Cumulative) | 47.67% N = 317 |
57.77% N = 383 |
0.0002 | 1.50 (1.21-1.86) | 65.41% N = 435 |
67.27% N = 446 |
0.4741 | 1.09 (0.87-1.36) |
| Age | 0.0007 | 0.7525 | ||||||
| < 50 | 32.02% | 41.29% | 1.49 (1.01-2.22) | 49.56% | 50.25% | 1.03 (0.70-1.50) | ||
| 50-75 | 54.71% | 62.73% | 1.39 (0.95-2.04) | 71.30% | 72.73% | 1.07 (0.71-1.63) | ||
| > 75 | 57.01% | 66.94% | 1.53 (1.04-2.23) | 76.17% | 76.45% | 1.02 (0.66-1.57) | ||
| Race | 0.0002 | 0.6142 | ||||||
| Caucasian | 58.33% | 68.42% | 1.55 (1.18-2.03) | 78.07% | 78.07% | 1.00 (0.73-1.37) | ||
| African American | 30.48% | 44.44% | 1.83 (1.05-3.17) | 52.38% | 56.41% | 1.77 (0.69-2.00) | ||
| Other | 18.27% | 21.11% | 1.20 (0.59-2.43) | 23.08% | 26.67% | 1.21 (0.63-2.33) | ||
| Sex | 0.0008 | 0.6642 | ||||||
| Female | 31.75% | 41.30% | 1.51 (0.86-2.65) | 56.35% | 51.09% | .081 (0.47-1.39) | ||
| Male | 51.39% | 60.42% | 1.44 (1.14-1.83) | 67.53% | 69.88% | 1.12 (0.87-1.44) | ||
| Marital Status | 0.0002 | 0.4799 | ||||||
| Married/Living with someone | 53.04% | 69.70% | 2.04 (1.50-2.76) | 72.38% | 76.58% | 1.25 (0.89-1.74) | ||
| Not Married | 41.25% | 43.33% | 1.09 (0.79-1.50) | 57.10% | 56.00% | 0.96 (0.69-1.32) | ||
| Charlson Comorbidity Score | 0.0003 | 0.5408 | ||||||
| 0 | 43.97% | 52.86% | 1.43 (1.03-1.98) | 60.26% | 63.21% | 1.13 (0.81-1.58) | ||
| 1 | 44.44% | 29.23% | 1.57 (0.98-2.51) | 64.44% | 34.86% | 1.09 (0.67-1.78) | ||
| 2+ | 54.71% | 64.96% | 1.53 (1.05-2.24) | 73.09% | 72.65% | 0.98 (0.65-1.48) | ||
| Mental health diagnoses | 0.0003 | 0.4929 | ||||||
| No Mental Health Diagnosis | 54.55% | 62.66% | 1.40 (1.02-1.92) | 70.78% | 72.47% | 1.09 (0.77-1.54) | ||
| Substance abuse only | 41.38% | 58.62% | 2.01 (0.96-4.20) | 60.34% | 68.97% | 1.46 (0.68-3.14) | ||
| Psychiatric only | 43.09% | 55.62% | 1.66 (1.10-2.50) | 64.89% | 64.04% | 0.96 (0.63-1.48) | ||
| Dual diagnosis | 39.64% | 46.85% | 1.34 (0.79-2.29) | 54.05% | 56.76% | 1.12 (0.66-1.89) | ||
| Rural/Urban Status | 0.0007 | 0.6519 | ||||||
| Urban | 46.43% | 55.98% | 1.47 (1.17-1.84) | 64.82% | 65.45% | 1.03 (0.81-1.30) | ||
| Rural | 70.59% | 75.41% | 1.28 (0.50-3.27) | 76.47% | 85.25% | 1.78 (0.61-5.14) | ||
*p-values from chi-square test.
**Logistic regression model included predictor, sex, rural/urban status; bolded odds ratios are statistically significant.