Table 2. Alert-eligible imaging tests completed within 90 days by intervention and usual care groups at baseline and follow-up.
| Baseline ( n = 1,671) | Follow-up ( n = 2,063) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Usual care ( n = 1,213) n (% a ) | Intervention ( n = 458) n (% a ) | Difference (%) | p -Value b | Usual care ( n = 1,484) n (% a ) | Intervention ( n = 558) n (% a ) | Difference (%) | p -Value b | Difference in difference | |
| Mammogram | 125/616 (20.3) | 50/243 (20.6) | 0.3 | 0.926 | 141/673 (21.0) | 83/276 (30.1) | 9.1 | 0.003 | 8.8 |
| Ultrasound | 31/227 (13.7) | 18/99 (18.2) | 4.5 | 0.293 | 62/335 (18.5) | 21/119 (17.7) | −0.8 | 0.835 | −5.3 |
| CT | 28/134 (20.9) | 15/50 (30.0) | 9.1 | 0.194 | 49/181 (27.1) | 20/82 (24.4) | −2.7 | 0.647 | −11.8 |
| Nuclear medicine | 27/160 (16.9) | 10/41 (24.4) | 7.5 | 0.268 | 52/231 (22.5) | 10/50 (20.0) | −2.5 | 0.698 | −10.0 |
| MRI | 12/51 (23.5) | 7/17 (41.2) | 17.7 | 0.160 | 2/30 (6.7) | 6/19 (31.6) | 24.9 | 0.022 | 7.2 |
| General radiology | 5/24 (20.8) | 1/6 (16.7) | −4.1 | 0.819 | 4/30 (13.3) | 2/12 (16.7) | 3.4 | 0.780 | 7.5 |
| Other | 0/2 (0) | 0/2 (0) | 0 | n/a | 0/4 (0) | 0/0 (0) | 0 | n/a | 0 |
| Total | 228/1,213 (18.8) | 101/458 (22.1) | 3.3 | 0.135 | 310/1,484 (20.9) | 142/558 (25.5) | 4.6 | 0.027 | 1.3 |
Abbreviations: CT, computed tomography; MRI, magnetic resonance imaging.
Note: Bold values denote statistically significant results.
a
Totals may not add to 100% due to rounding.
b
Chi-square statistic.