| Response rate |  | |||
---|---|---|---|---|---|
Age group (in years) | First generation device | Second generation device | Â | ||
 | n | % | n | % | p-valuea |
60-64 | 71 | 25.9% | 26 | 33.8% | 0.173 |
55-59 | 330 | 32.0% | 85 | 32.4% | 0.901 |
50-54 | 519 | 35.8% | 141 | 38.6% | 0.323 |
45-49 | 564 | 34.1% | 122 | 32.0% | 0.435 |
40-44 | 706 | 34.3% | 169 | 37.1% | 0.250 |
35-39 | 1,085 | 36.3% | 213 | 36.8% | 0.836 |
30-34 | 846 | 33.5% | 180 | 34.3% | 0.717 |
Total | 4,121 | 34.4% | 936 | 35.4% | Â |