Table 2

Number of screening ultrasound examinations per pregnancy between 2006 and 2014

Procedures	2006	2007	2008	2009	2010	2011	2012	2013	2014	P value
T1 ultrasound	0.73	0.79	0.92	0.88	0.89	0.89	0.87	0.88	0.88	0.102
T2 ultrasound	0.84	0.80	0.96	0.92	0.94	0.95	0.94	0.95	0.95	0.033
T3 ultrasound	0.82	0.74	0.89	0.85	0.88	0.87	0.87	0.89	0.87	0.102
Surveillance	0.07	0.11	0.11	0.13	0.14	0.17	0.18	0.24	0.26	0.003
Fetal heart	0.01	0.02	0.01	0.02	0.02	0.02	0.02	0.02	0.03	<0.001
Total	2.47	2.45	2.89	2.79	2.87	2.90	2.89	2.98	2.98	0.005

P values for simple linear regression of the number of procedures per pregnancy by year.
T1, first trimester; T2, second trimester; T3, third trimester.