Figure 1: Frequency distribution & bar diagram of the combined score of ventilated patients

<p>In order to obtain the range of scores that represent 95% of the observations that ended in<br> respiratory failure, we used the frequency distribution curve (fig 9) with (2SD) above and below the<br> calculated mean. This gives a value of (16-24) as the limits of interval including the score of<br> patients at risk of developing respiratory failure</p>