Table 4: Multi-level linear regression assesses changes in mean score of the Vietnamese Comfort-B between first and second assessment with before, during and after wound dressing replacement (n=450)

	Coef.	p-value	95%CI
Second vs. First assessment	-0.05	0.86	-0.61; 0.51
During vs. Before wound dressing replacement	14.45	<0.01	13.77; 15.13
After vs. Before wound dressing replacement	4.75	<0.01	4.07; 5.43

Coef.: regression coefficient; 95%CI: 95% Confident Interval Multi-level linear regression random effect.
15 nurses rated 5 videos before, during and after wound dressing replacement at first and second assessment (n=15*5*3*2=450).