Table 4 Mann–Whitney U-test comparing the change of knowledge and attitudes towards dementia between those provided and did not provided voluntary services
|  | Did not provide services (n = 30) | Provided services (n = 77) | Mann–Whitney U | Z | p-valuea |
|---|---|---|---|---|---|
Median [IQR] | |||||
Alzheimer’s Disease Knowledge Scale | |||||
 Life impact sub-score | 0 [0 – 0] | 0 [0 – 1] | 927.00 | -1.82 | .069 |
 Risk factor sub-score | 0 [0 – 0] | 0 [0 – 1] | 890.50 | -1.99 | .046 |
 Symptom sub-score | 0 [0 – 0] | 0 [0 – 1] | 945.00 | -1.72 | .085 |
 Treatment and management sub-score | 0 [0 – 0] | 0 [0 – 1] | 995.50 | -1.25 | .212 |
 Assessment and diagnosis | 0 [0 – 0] | 0 [0 – 0] | 1138.00 | -0.14 | .891 |
 Caregiving sub-score | 0 [0 – 0] | 0 [0 – 1] | 953.00 | -1.57 | .116 |
 Course sub-score | 0 [0 – 0] | 0 [-1.0 – 0.5] | 1095.50 | -1.57 | .645 |
 Total score | 0 [0 – 0] | 0 [0 – 3] | 806.00 | -2.56 | .011 |
Dementia Attitudes Scale | |||||
 Comfort sub-score | 0 [0 – 0] | 0 [-1.5—6] | 1101.00 | -0.39 | .697 |
 Knowledge sub-score | 0 [0 – 0] | 0 [-2.5—5] | 838.00 | -2.24 | .025 |
 Total score | 0 [0 – 0] | 0 [0 – 10] | 769.50 | -2.73 | .006 |