TABLE I:

Results of using random batch generator (RBG), balanced batch generator (BBG) and balanced loss function (BLF). Columns show mean and standard deviation (MAE and SDE) of estimation error in GAs of 5–9 months together with the average over all months (All). A one-sided Wilcoxon test was used to compare RBG model with BBG and BBG+BLF models.

		Gestational Age (months since reported last menstrual period)
		5	6	7	8	9	All
MAE	RBG BBG $\text{BBG+BLF}$	1.99 1.26 0.91	1.52 1.26 1.16	0.87 0.84 0.71	0.19 0.53 0.40	0.84 0.76 0.96	0.82 0.79 0.79
SDE	RBG BBG $\text{BBG+BLF}$	0.90 0.82 0.46	0.73 0.77 0.69	0.35 0.52 0.43	0.33 0.43 0.45	0.84 0.58 0.44	0.6 0.6 0.53
Wilcoxon	BBG	10−3	9 × 10−3	10−4	0.16	0.99	0.01
$p$-value	$\text{BBG+BLF}$	5 × 10−7	5 × 10−7	10−9	6 × 10−4	4 × 10−5	10−21