Free text responses on ease of use were grouped into ‘positive’ or ‘negative’ (Fig. 4). Sixty-eight per cent (n = 17) of comments on the paper tool were positive, with 5 negative comments relating to layout and appearance of the tool and 3 respondents making neutral or no comment. There were no negative comments relating to the smart phone version of the tool, with 92% making positive comments and the remaining 2 participants making no or neutral comment. Many of the comments relating to the smart phone app were regarding the decrease in time taken to make a decision in comparison to the paper app, which was felt to be a positive benefit in a time-critical scenario.