Penehcyclidine and awareness during anaesthesia: caution with zero numerators

Abstract

Throughout the article ‘penehyclidine’ is misspelled as ‘penehcyclidine’. The colours in Table 1 were accidentally omitted and this Table is printed here in its correct form. The x-axis label and legend to Figure 2 were incorrectly reproduced. The x-axis title should read “Number of red balls”, and the legend should read as below. The Figure and Legend are printed here in their correct form. The text in the second column, 3rd page of this paper [1] should read as follows: This is the distribution obtained when performing binomial sampling without replacement; for example, the probabilities of obtaining 0, 1, 2, 3, 4 and 5 red balls from an urn of 15 red and 5 white balls. The authors and publishers apologise for these errors.