Table 1 Comparison of the variations of the CW

Country

USA (1)

Morocco

USA (2)

France

Iran

Sri Lanka

Total brains

994

100

414

200

102^b

225

Types

Configuration

1

Typical

192(19)

18(18)

20(5)

29(14.5)

29(28)

32(14)

2

all segments hypoplastic

54(5)

0(0)

0(0)

10(5)

0(0)

0(0)

3

hypoplastic AcoA

91(9)

11(11)

6(1)

9(4.5)

0(0)

32(14)

4

Unilateral hypoplastic PcoA

88(9)

14(14)

24(6)

28(14)

20(20)

26(11.5)

5

Unilateral hypoplastic PcoA and AcoA

41(4)

6(6)

12(3)

10(5)

4(4)

15(7)

6

Bilateral hypoplastic PcoAs;

126(13)

24(24)

131(32)

44(22)

28(27)

52(23)

7

Bilateral hypoplastic PcoAs and hypoplastic AcoA

67(7)

10(10)

58(14)

34(17)

4(4)

37(16)

8

hypoplastic A1

38(5)

2(2)

0(0)

3(1.5)

0(0)

6 (3)

9

Unilateral hypoplastic P1

47(5)

3(3)

4(0.9)

5(2.5)

1(0.9)

2(0.8)

10

Bilateral hypoplastic P1s

33(3)

1(1)

16(4)

6(3)

0(0)

1(0.4)

11

hypoplastic P1 and contralateral A1

2(0.2)

0(0)

10(2)

0(0)

0(0)

0(0)

12

hypoplastic P1 and ipsilateral A1

20(2)

1(1)

1(0.2)

3(1.5)

1(0.9)

4 (2)

13

Bilateral hypoplastic P1s and A1

5(0.5)

0(0)

3(0.7)

1(0.5)

0(0)

1(0.4)

14

hypoplastic A1 and contralateral PcoA

7(0.7)

0(0)

1(0.2)

1(0.5)

0(0)

0(0)

15

Hypoplastic AcoA and P1

35(3.5)

4(4)

0(0)

4(2)

1(0.9)

6(3)

16

hypoplastic PcoA, ipsilateral A1 and AcoA

16(2)

3(3)

2(0.4)

2(1)

0(0)

0(0)

17

hypoplastic PcoA and contralateral P1

26(3)

0(0)

46(11)

3(1.5)

2(2)

1(0.4)

18

A1 and bilateral hypoplastic PcoAs

58(6)

0(0)

21(5.0)

6(3)

0(0)

4(2)

19

hypoplastic PcoA, AcoA and contralateral P1

17(2)

1(1)

28(7)

1(0.5)

1(0.9)

0(0)

20

hypoplastic P1, contralateral PcoA and ipsilateral A1

10(1)

1(1)

5(1)

0(0)

0(0)

0(0)

21

Bilateral hypoplastic P1s and AcoA

13(1)

0(0)

10(2)

1(0.5)

0(0)

1(0.4)

22

hypoplastic PcoA, ipsilateral A1 and contralateral P1

3(0.3)

0(0)

8(2)

0(0)

0(0)

0(0)

Others

5(0.5)

1(1)

8(2)

0(0)

1(0.9)

5(2)