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Rh negative blood group is a rare blood group in China, as it only accounts for 0.3-0.4 percent of the Han population. Therefore, low inventory is often found in blood collection and supply agencies in many regions in China. On July 18, 2018 blood stockpile of O-negative and B-negative in Guangzhou Blood Center reached the warning line, and we took measures for emergency recruitment. O-negative and B-negative blood donors whose last donation dates were between January 1, 2015 and December 31, 2017 were identified and randomly assigned to three groups. Three different recruitment text messages were send to these groups respectively. At the same time, A-negative and AB-negative blood donors were marked as control group. We observed the re-donation rates among four groups within three months.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Gain-frame SMS | Experimental | SMS messages "Dear Rh negative blood donors: Hello! As the Rh negative O/B blood stockpile is low now, but patients who are this blood type are in urgent need. If you are available, we hope that you can offer a helping hand to save their lives. Thank you for your support." were send to donors in this group. |
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| Loss-frame SMS | Experimental | SMS messages "Dear Rh negative blood donors: Hello! As the Rh negative O/B blood stockpile is low now, but patients who are this blood type are in urgent need. If you are available, we hope that you can offer a helping hand to prevent them from death. Thank you for your support." were send to donors in this group. |
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| Control SMS | Experimental | SMS messages "Dear Rh negative blood donors: Hello! As the Rh negative O/B blood stockpile is low now, but patients who are this blood type are in urgent need. If you are available, we hope that you can donate blood again. Thank you for your support." were send to donors in this group. |
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| Control group | No Intervention | Donors in this group were not received SMS reminders. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Gain-frame SMS | Other | Emergency recruitment cell phone short messages that emphasizing donating blood can save patients' lives were sent to donors in this group. |
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| Measure | Description | Time Frame |
|---|---|---|
| Re-donation rate | Intention-to-treat were applied. Re-donation rate was defined as the number of donors in each group devided by donors who re-donated within 3 months. | 3 months |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Guangzhou Blood Center | Guangzhou | Guangdong | 510095 | China |
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| Loss-frame SMS | Other | Emergency recruitment cell phone short messages emphasizing that donating blood can prevent patients from death were sent to donors in this group. |
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| Control SMS | Other | Emergency recruitment cell phone short messages that only mentioning the low Rh-negative blood stockpile were sent to donors in this group. |
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