Table 3.

A comparison of strict versus relaxed biometry measurements obtained using volume sweep imaging protocol

Variable	All measurements (n = 109)	Second trimester only (n = 68)	Third trimester only (n = 58)
Number of biometry measurements achieved (strict)	2 (0–4)	2 (0–4)	2 (0–4)
Number of biometry measurements achieved (including relaxed)	3 (0–4)	3 (0–4)	3 (0–4)
Estimated gestational age (days)
Stricta	195 ± 49 (n = 109)	158 ± 27 (n = 60)	242 ± 23 (n = 49)
Including relaxeda	194 ± 51 (n = 122)	155 ± 28 (n = 67)	243 ± 24 (n = 55)
p-valueb	0.37	0.44	0.58

^a values are mean ± standard deviation

^busing paired t-test