Table 2.

Agreement between the trainees and the tutor in the recognition of the LUS basic signs

LUS basic signs (recognition of)	Students without any previous experience in ultrasound (n = 9)			Students with previous limited experience in Cardiac ultrasound (n = 10)
	k	95 % CI	Agreement strength	k	95 % CI	Agreement strength
The bat sign	0.30	0.28–0.33	Fair	0.28	0.26–0.31	Fair
The lung sliding	0.71	0.65–0.79	Substantial	0.77	0.73–0.80	Substantial
The seashore sign (M-mode)	0.45	0.41–0.49	Moderate	0.70a	0.68–0.72	Substantial
The A lines	0.90	0.81–1.00	Excellent	0.91	0.81–1.00	Excellent
The quad sign	0.33	0.29–0.40	Fair	0.28	0.25–030	Fair
The sinusoid sign	0.44	0.41–0.46	Moderate	0.44	0.41–0.46	Moderate
The fractal sign	0.30	0.27–0.32	Fair	0.35	0.28–0.40	Fair
The tissue-like sign	0.80	0.78–0.82	Substantial	0.80	0.79–0.81	Substantial
The B lines recognition	0.90	0.88–0.92	Excellent	0.90	0.86–0.94	Excellent
The B lines quantification	0.70	0.67–0.73	Substantial	0.72	0.70–0.74	Substantial
The lung rockets	0.50	0.48–0.52	Moderate	0.52	0.51–0.53	Moderate
The stratosphere sign (M-mode)	0.80	0.78–0.82	Substantial	0.84a	0.82–0.84	Excellent
The lung point	0.80	0.78–0.82	Substantial	0.79	0.78–0.80	Substantial
The lung pulse	0.80	0.80–0.80	Substantial	0.78	0.77–0.79	Substantial
The dynamic air bronchogram	0.78	0.77–0.79	Substantial	0.76	0.73–0.79	Substantial

CI confidence intervals

^aSignificantly different between the two groups