My best guess on that table, looking at the full report (caveat: I am emphatically not an expert): 1) The VE calculations look correct: they’re almost precisely what I get by division of my naïve incidence rate calculations. I assume the small discrepancy is due to the data’s being discrete: if you have 7 cases out of 996, your best prediction of incidence rates won’t be precisely 7⁄996.
2) From my guess the numbers in brackets in the first two columns aren’t percentage rates at all. Rather they are “Surveillance time in person years for given endpoint across all participants within each group at risk for the endpoint”. This description is at the bottom of the table, without any asterisk or similar. I assume that this is an error: there was supposed to be an asterisk for that from the bracketed number in the first two columns.
This seems plausible for the data: the pre-14-days numbers are under half of the post-14-days numbers, and the median follow-up time was 28 days. But it’s entirely possible that I’m wrong.
My best guess on that table, looking at the full report (caveat: I am emphatically not an expert):
1) The VE calculations look correct: they’re almost precisely what I get by division of my naïve incidence rate calculations. I assume the small discrepancy is due to the data’s being discrete: if you have 7 cases out of 996, your best prediction of incidence rates won’t be precisely 7⁄996.
2) From my guess the numbers in brackets in the first two columns aren’t percentage rates at all. Rather they are “Surveillance time in person years for given endpoint across all participants within each group at risk for the endpoint”. This description is at the bottom of the table, without any asterisk or similar. I assume that this is an error: there was supposed to be an asterisk for that from the bracketed number in the first two columns.
This seems plausible for the data: the pre-14-days numbers are under half of the post-14-days numbers, and the median follow-up time was 28 days.
But it’s entirely possible that I’m wrong.