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Table 2 Unadjusted and Adjusted odds of response by patient characteristics and incentive condition

From: A comparison of small monetary incentives to convert survey non-respondents: a randomized control trial

  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)
  1. *p-values from chi-square test.
  2. **Logistic regression model included predictor, sex, rural/urban status; bolded odds ratios are statistically significant.