Table 3.

Characteristics of Participants and Univariate Analysis.

Factor	Overall		Non-tertiary		Tertiary		P value*
	N	Mean/N (STD/%)	N	Mean/N (STD/%)	N	Mean/N (STD/%)
Female	68	25 (36.76%)	24	7 (29.17%)	44	18 (40.91%)	0.34
Experience (years)	103	21.60 ± 10.27	32	21.03 ± 10.23	50	22.34 ± 9.84	0.56
Volume (obstetric scans/week)	102	35.27 ± 28.29	32	14.47 ± 10.37	50	49.84 ± 27.73	<0.001
Age (years)	67	55.94 ± 9.51	24	54.79 ± 8.30	43	56.58 ± 10.16	0.46
Additional training in cardiac	71	48 (67.61%)	25	13 (52.00%)	46	35 (76.09%)	0.038
Feedback	93	4.44 ± 0.83	32	4.13 ± 1.05	50	4.66 ± 0.58	0.005
Facilitating conditions	93	4.28 ± 0.88	32	3.81 ± 0.98	50	4.58 ± 0.68	<0.001
Self-efficacy 4Cr	94	3.98 ± 0.65	32	3.68 ± 0.67	50	4.18 ± 0.54	<0.001
Self-efficacy outflow	94	3.62 ± 0.90	32	3.15 ± 0.93	50	3.98 ± 0.71	<0.001
Outcome expectancy 4C	95	4.56 ± 0.76	32	4.36 ± 0.90	50	4.65 ± 0.71	0.11
Outcome expectancy outflow	95	4.59 ± 0.75	32	4.25 ± 0.88	50	4.73 ± 0.68	0.007
Perceived ease of use 4C	95	4.39 ± 0.86	32	4.00 ± 0.91	50	4.63 ± 0.78	0.001
Perceived ease of use outflow	95	4.20 ± 0.83	32	3.78 ± 0.90	50	4.48 ± 0.73	<0.001
Knowledge	71	0.50 ± 0.26	25	0.37 ± 0.24	46	0.58 ± 0.25	<0.001
Outcomes
Time to interpret 4C images (min)	82	2.78 ± 2.89	32	3.25 ± 3.65	50	2.48 ± 2.27	0.24
Time to interpret outflow images (min)	81	3.57 ± 3.27	31	3.74 ± 3.90	50	3.47 ± 2.86	0.72
Overall accuracy (%)	82	0.67 ± 0.14	32	0.62 ± 0.13	50	0.70 ± 0.15	0.02
Accuracy 4C (%)	82	0.71 ± 0.18	32	0.66 ± 0.16	50	0.75 ± 0.19	0.02
Accuracy outflow (%)	72	0.61 ± 0.15	26	0.59 ± 0.17	46	0.63 ± 0.14	0.32
Accuracy adequate (%)	82	0.59 ± 0.16	32	0.55 ± 0.15	50	0.61 ± 0.17	0.12
Accuracy normal (%)	80	0.76 ± 0.18	30	0.70 ± 0.19	50	0.79 ± 0.17	0.04

^*Data are presented as mean ± SD for continuous measures and frequency (percentage) for categorical measures. Comparisons between non-tertiary and tertiary use Chi-square test for the categorical variables and T-test for continues variables 4C – four chamber