[Table/Fig-1]:

Mean values of placental thickness in 1st trimester-12 &13 weeks (32 subjects) 2nd trimester 14-26 weeks (89 subjects)

Gestation age in weeks	Sample Subjects (n)	Mean with standard deviation
12	18	15.16 ± 0.5
13	14	17.84 ± 0.79
14	6	18 ± 0.46
15	5	18.28 ± 0.77
16	4	21.95 ± 1.60
17	2	21.65 ± 6.98
18	2	23.6 ± 8.89
19	2	23.25 ± 3.81
20	11	22.4 ± 1.15
21	24	23.7 ± 0.88
22	15	25.64 ± 1.15
23	8	24.57 ± 1.77
24	4	26.62 ± 2.99
25	3	27.73 ± 0.62
26	3	31.73 ± 0.57