Table 2.

Novice- vs expert-obtained clip quality score reported at median average scores (interquartile range).

Zone	Novice score*	Expert score*	P-value**	Novice interpretable N (out of 30)	Expert interpretable N (out of 30)	P-value
1	3 (2–3)	3 (1–3)	0.63	23	21	0.01
2	3 (3–3)	3 (3–3)	1.00	26	28	1.00
3	3 (1–3)	3 (2–3)	0.18	21	24	0.005
4	3 (3–3)	3 (3–3)	0.75	27	29	1.00
5	3 (2.5–3.0)	3 (2.5–3.0)	0.75	26	24	0.02
6	3 (2.5–3.0)	3 (3–3)	0.23	26	28	1.00
7	3 (2–3)	3 (3–3)	0.39	27	27	0.02
8	3 (3–3)	3 (3–3)	0.13	25	28	0.31

*This score references the gold standard score which is the average of the expert raters’ scores.

**Wilcoxon signed rank sum test.