Table 4.
Logistic regression predicting co-operation measures
| Time 1 | Time 2 | |||
|---|---|---|---|---|
| Email co-operation Blood donors (N = 103: 74% provided their email) | Non-blood donors (N = 307: 62% provided their email) | Behavioural co-operation Blood donors (N = 69: 38% replied) | Non-blood donors (N = 149: 38% replied) | |
| Step 1 | R2 = 0·14, Step χ2 = 10·7 (P = 0·005) | R2 = 0·09, Step χ2 = 20·2(P < 0·001) | R2 = 0·009, Step χ2 = 0·44 (P = 0·80) | R2 = 0·01, Step χ2 = 1·25 (P = 0·53) |
| Sex (1 = male) | −1·070*> | −0·469 | −0·223 | −0·407 |
| Intentions to donate blood (T1) | 0·081**> | 0·070***> | 0·020 | −0·003 |
| Step 2 | R2 = 0·30, Step χ2 = 12,9 (P = 0·024) | R2 = 0·13, Step χ2 = 9·7 (P = 0·08) | R2 = 0·22, Step χ2 = 11·4 (P = 0·045) | R2 = 0·04, Step χ2 = 3·3 (P = 0·64) |
| Impure Altruism (T1) | 0·078 | 0·020 | 0·115 | −0·036 |
| Self-regarding (T1) | 0·012 | 0·035*> | 0·082*> | −0·008 |
| Kinship (T1) | −0·038 | 0·026 | −0·055 | 0·011 |
| Reluctant altruism (T1) | 0·089 | −0·029 | 0·088 | −0·057 |
| Egalitarian warm glow(T1) | 0·115 | 0·019 | 0·234*> | 0·000 |