A quality analyst at a healthcare facility recently conducted a Gauge R&R study involving three nurses who measured the blood pressure of $10$ different patients. According to the Gauge R&R output below, the total variability in the measurement system is within the acceptable threshold of $6\mathrm{.}68\%.$ Despite being within acceptable limits$,$ the analyst wants to better understand where most of the variation comes from. Based on the Gauge R&R output below, what accounts for most of the variability?

Based on the Gauge R&R output, what accounts for most of the variability?Gauge R&R $-$ Variance Components $($ANOVA$)$ Method