Table 3 Logistic regression predicting return behaviour at 3 months in first-time donors

From: Warming up cool cooperators

    

95% CI

 
 

B (s.e.)

P

OR

Lower

Upper

Cohen’s d

Gender

−0.03 (0.06)

0.598

0.971

0.896

1.084

−0.016

Age

0.023 (0.002)

<0.001

1.023

1.019

1.028

0.012

Blood group

 

0.022

    

 A−

0.098 (0.115)

0.394

1.103

0.880

1.382

0.054

 A+

−0.009(0.060)

0.838

0.991

0.880

1.116

−0.005

 O−

0.266 (0.093)

0.004

1.304

1.087

1.565

0.146

Message treatment

 

0.120

    

 WG + I

0.246 (0.108)

0.023

1.279

1.035

1.580

0.136

 WG

−0.010 (0.109)

0.928

0.990

0.800

1.226

−0.005

 IA + I

0.105 (0.109)

0.334

1.111

0.898

1.374

0.058

 IA

0.111 (0.109)

0.308

1.118

0.903

1.384

0.061

Booking status

1.176 (0.130)

<0.001

3.242

2.513

4.182

0.648

Interactions

 

0.004

    

 Booking status × WG + I

−0.506 (0.180)

0.005

0.603

0.424

0.859

−0.279

 Booking status × WG

0.097 (0.184)

0.596

1.102

0.768

1.581

0.053

 Booking status × IA + I

−0.335 (0.180)

0.064

0.715

0.502

1.019

−0.185

 Booking status × IA

−0.297 (0.180)

0.098

0.743

0.523

1.057

−0.164

Intercept

−1.263 (0.119)

<0.001

0.283

   

R2

0.10

     
  1. Gender (0 = men; 1 = women); blood group O+, reference category; booking status (0 = did not book another appointment to donate; 1 = did book another appointment to donate). The reference group for the message treatments is the BAU no message control. All tests are two-tailed and no adjustment for multiple comparisons was applied. B coefficients are unstandardized coefficients. Exact P values for (1) age, P = 9.5071 × 10−23; (2) booking status, P = 1.4149 × 10−19; and (3) constant, P = 9.6695 × 10−27.
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