We found that clinically important bleeding was associated with an increase in mortality (absolute risk increase, 20 30%; RR increase, 1 4) and an increased length of ICU stay (approximately 4 8 days) using three different analytic methods.
In fact," he adds, eyebrows bouncing with amusement, "we can even teach doctors". 1 Always ask: "What is the absolute risk increase?" Journalists are fond of referring to a "100% risk increase", a "fivefold" increase, and so on – but the absolute risk might be tiny.
The intervention harm signal was remarkably wide: Absolute risk increase ranged from 2.6 to 29%% (mean 5%%), and the number needed to harm ranged from 3.5 to 38.5 (mean 20).
We found wide ranges in sponsorship (industry or not), type(s) of intervention(s), use of DSMBs, presence of interim analyses and early stopping rules, absolute risk increase (ARI), and whether or not adequate prior proof-of-principle Phase II studies were done of RCTs that found increased mortality rates of the intervention compared to control groups.
Our hypothesis was that there would be wide ranges in sponsorship (industry or not), type(s) of intervention(s), use of DSMBs, presence of interim analyses and early stopping rules, absolute risk increase (ARI), and whether or not adequate prior proof-of-principle Phase II studies were done of RCTs that found increased mortality rates of the intervention compared to control groups.
We recorded source of sponsorship, geographical settings, sample sizes, randomization, blinding interventions used, absolute mortality rates, absolute risk increase (ARI), odds ratios, relative risks and number needed to harm, whether or not each RCT had a DSMB, pre-specified interim analyses, whether or not there were pre-specified stopping rules, and whether or not each RCT was stopped early.
The absolute risk increases (ARIs) ranged widely from 2.6 to 29%% (mean 13%%) such that the number needed to harm also ranged widely from 3.5 to 38.5 (mean 20) (Table 2; Fig. 2).
Even when both vaccine effectiveness and influenza incidence rates were low, the absolute risk increases observed in our simulations under these conditions were extremely small.
The absolute risk increases from 5.1% (105/2049) to 11.2% (293/2612) in all-comers including patients with shock and from 3.3% (33/984) to 5.4% (69/1270) in normotensive patients with an increased right-to-left ventricle ratio [ 17].
The absolute risk increases of 6.6% for neurologic disability and 9.9% for low cognitive function associated with five-minute Apgar score <7 imply a low sensitivity and thus a limited clinical utility in predicting long-term disability.
