Table 3

Value of 'asking one question' and 'reading the informative leaflet or asking one question' to recall the clinical trial

Parameter
OR, complete versus incomplete recall
Sensitivity
Specificity
Positive predictive value
Negative predictive value
Likelihood ratio

Asked one question
5.3 (1.3–21)
0.57 (0.29–0.82)
0.80 (0.61–0.92)
0.57 (0.29–0.82)
0.80 (0.61–0.92)
2.86
Read leaflet or asked one question
8.7 (1.0–75)
0.93 (0.66–1.00)
0.40 (0.23–0.59)
0.42 (0.25–0.61)
0.92 (0.64–1.00)
1.55

OR, odds ratio. In the complete recall group, patients able to mention their study participation and the two clinical trial components; in the incomplete recall group, patients were unable to mention their clinical trial participation or one of the clinical trial components. Figures in parentheses are 95% confidence intervals.

Chenaud et al. Critical Care 2006 10:R170   doi:10.1186/cc5120