Table 1.
Physician response rates in the four incentive groups, both overall and after stratifying on physician characteristics.
| No. /Total No. (%) | |||||
|---|---|---|---|---|---|
| Immediate $25 Cash |
Immediate $25 Check |
Promised $25 Check, No SSN |
Promised $25 Check, SSN |
P- Value* |
|
| Overall | 90/263 (34) | 50/255 (20) | 26/265 (10) | 20/266 (8) | <0.0001 |
| Characteristic | |||||
| Female sex | 22/81 (27) | 11/69 (16) | 6/69 (9) | 6/78 (8) | 0.002 |
| Age (years) | |||||
| Less than 50 | 45/143 (31) | 25/131 (19) | 13/136 (10) | 6/137 (4) | <0.0001 |
| 50 or older | 43/115 (37) | 24/116 (21) | 11/114 (10) | 14/118 (12) | <0.0001 |
| Region | |||||
| South | 30/98 (31) | 21/100 (21) | 6/88 (7) | 3/80 (4) | <0.0001 |
| Northeast | 20/46 (43) | 8/52 (15) | 8/63 (13) | 6/79 (8) | <0.0001 |
| West | 20/60 (33) | 10/51 (20) | 8/61 (13) | 5/59 (8) | 0.003 |
| Midwest | 17/51 (26) | 11/47 (23) | 4/49 (8) | 6/47 (13) | 0.007 |
| Primary Specialty | |||||
| Primary Care | 42/129 (33) | 13/97 (13) | 12/115 (10) | 11/102 (11) | <0.0001 |
| Surgery | 10/40 (25) | 10/60 (17) | 5/54 (9) | 3/54 (6) | 0.03 |
| Procedural Specialty | 18/48 (38) | 13/42 (31) | 4/40 (10) | 3/51 (6) | 0.0001 |
| Nonprocedural Specialty | 16/38 (42) | 12/49 (24) | 5/52 (10) | 3/47 (6) | <0.0001 |
| Non-Clinical | 3/5 (60) | 2/4 (50) | - | 0/6 (0) | 0.10 |
| Other | 1/3 (33) | 0/3 (0) | 0/4 (0) | 0/4 (0) | 0.43 |
*
Using the Pearson χ2 test or Fisher’s Exact test when cell counts less than 5.