FIG. 2.

Correlation of change in physiological factors with change in subjective pain measurements. (A) Significant correlation existed between change in Likert scale responses and respiratory rate. (B) A positive sloping trend line for change in heart rate and change in subjective responses positively supports the calming effect of the simulation. (C) As opposed to heart rate, a decreasing trend for change in mean arterial pressure and change in Likert ratings indicates the same pain reducing effect. (D) Change in oxygen saturation and Likert responses showed little correlation, again, most likely due to the small range of oxygen saturation.