[Table/Fig-5]:

Comparision of t wave abnormalities in chest leads between three groups

Lead	Control (A)			2nd Trimester			3rd Trimester			Difference between groups
	Flat n%	Inverted n%	Total n%	Flat n%	Inverted n%	Total n%	Flat n%	Inverted n%	Total n%	X2	A-B	A-C	B-C
V1	0	35 70	35 70	1 2	40 80	40 80	3 6	42 84	45 90	6.50 p<0.05 S	1.97 p>0.05 NS	6.25 p< 0.05 S	1.33 p> 0.05 NS
V2	0	-	-	1 2	9 18	10 20	1 2	9 18	10 20	11.5 p<0.01 S	11.1 p<0.01 S	11.11 P<0.01 S	0.0 p>0.05 NS
V3	-	-	-	2 4	8 16	10 20	1 2	3 6	4 8	11.9 p< 0.01 S	11.1 p<0.01 S	4.19 p<0.05S	2.99 p>0.05 NS
V4	-	-	-	1 2	1 2	2 4	-	2 4	2 4	2.06 p>0.05 NS	NS	NS	NS
V5	-	-	-	-	-	-	-	-	-	-	-	-	-
V6	-	-	-	-	-	-	-	-	-	-	-	-	-