| n or mean [std] | Percent, % |
---|---|---|
overall response rate (mean [SD])a | 24% [34%] | Â |
levels of response rate | ||
  0 | 279 | 38.2 |
  > 0 & ≤0.1 | 153 | 20.9 |
  > 0.1 & ≤0.6 | 151 | 20.7 |
  > 0.6 & ≤1 | 148 | 20.2 |
did not respond to the first message | 428 | 58.6 |
did not respond to the last message | 611 | 83.6 |
unsubscribed to receiving messages | 113 | 15.5 |