Intervention strategy typea | Year 11 | Year 22 | Year 33 |
---|---|---|---|
a. HP→IND | 27 (32%) | 17 (29%) | 27 (38%) |
b. HP→X→IND | 41 (48%) | 35 (59%) | 39 (54%) |
c. HP→[X-X]→IND | 16 (19%) | 7 (12%) | 6 (8%) |
Total | 84 | 59 | 72 |
Chi-square (χ2 ) df = 2 | 11.2 | 20.5 | 23.2 |
p value | <0.01 | <0.0001 | <0.0001 |