Table 5.

Multivariable Regression Model of Factors Associated with Accuracy in Fetal Heart Image Interpretation

Barrier	Overall (n=1420)		4C (N=710)		Outflow (N=710)		Adequacy (N=710)		Normality (N=710)
	Odds Ratio (CI)	P value	Odds Ratio (CI)	P value	Odds Ratio (CI)	P value	Odds Ratio (CI)	P value	Odds Ratio (CI)	P value
Self-efficacy outflow	1.02 (08,1.3)	0.840	0.96 (0.7,1.3)	0.783	1.08 (0.8, 1.4)	0.586	1.06 (0.8, 1.4)	0.678	0.97 (0.7,1.3)	0.841
Outcome expectancy 4C	1.08 (0.8, 1.5)	0.648	0.89 (0.6,1.4)	0.61	1.29 (0.8, 2.0)	0.254	1.28 (0.8, 1.9)	0.269	0.88 (0.5,1.4)	0.593
Outcome expectancy outflow	0.99 (0.7, 1.5)	0.945	1.34 (0.8, 2.3)	0.307	0.73 (0.4, 1.3)	0.262	0.77 (0.4, 1.3)	0.357	1.29 0.7,2.3)	0.384
Perceived ease of use 4C	0.89 (0.7, 1.1)	0.328	0.79 (0.6, 1.1)	0.182	1.00 (0.7, 1.4)	0.992	0.99 (0.7, 1.4)	0.972	0.77 (0.5,1.1)	0.149
Volume (obstetric scans/week)	1.01 (1.0, 1.01)	0.038	1.00 (0.99,1.01)	0.349	1.01 (1.0, 1.02)	0.043	1.00 (0.99,1.01)	0.412	1.01 (1.0,1.02)	0.028
Feedback	1.15 (0.9, 1.5)	0.233	1.48 (1.1, 2.1)	0.023	0.89 (0.6,1.3)	0.521	1.21 (0.9, 1.7)	0.256	1.11 (0.8,4.5)	0.536
Facilitating conditions	1.19 (0.9, 1.5)	0.175	1.06 (0.7, 1.5)	0.768	1.35 (0.9, 1.9)	0.102	0.97 (0.7, 1.4)	0.865	1.52 (1.04,2.2)	0.031
Knowledge	2.54 (1.4, 4.6)	0.002	3.66 (1.6,8.6)	0.003	1.83 (0.8, 4.2)	0.151	3.35 (1.4, 7.6)	0.004	1.90 (0.8,4.5)	0.149
Non-tertiary practice	0.67 (0.5, 0.99)	0.045	0.71 (0.4, 1.3)	0.248	0.61 (0.3, 1.1)	0.086	0.73 (0.4,1.3)	0.269	0.60 (0.3,1.1)	0.082
Image type	6.87 (3.5,13.5)	<0.001	5.51 (2.4, 12.9)	<0.001	7.56 (2.3,24.6)	0.001	6.51 (2.3,18.7)	0.001	1.75 (0.6,4.9)	0.29

^*Multivariable models were also adjusted for image test version and view (outflow vs. 4C). Odds ratios are for each 1 score increasing in above barriers, each additional ultrasound per week for volume, or increase in knowledge to 100%, and abnormal/inadequate image vs. normal/adequate image