Gestational

weeks

UCH

Ip

Woo

Rogers

Fok 1987

Fok 2003^#

ANOVA

p-value

25

N = 14

768 (80)

N = 32

780 (125)

0.68

26

N = 28

903 (105)

N = 23

840 (97)

0.027

27

N = 18

1037 (139)

N = 20

965 (148)

N = 37

1020 (180)

0.08

28

N = 18

1127 (196)

N = 13

1681 (640)*

N = 23

1106 (186)

N = 30

1095 (157)

N = 46

1130 (170)

<0.001

29

N = 23

1270 (231)

N = 25

1530 (563)^a

N = 21

1253 (195)

N = 45

1239 (210)

N = 62

1260 (178)

<0.001

30

N = 40

1364 (238)

N = 43

1938 (708)*

N = 38

1418 (242)

N = 41

1405 (197)

N = 55

1470 (249)

<0.001

31

N = 62

1554 (240)

N = 41

2170 (747)*

N = 37

1607 (274)

N = 20

2409 (631)*

N = 52

1598 (208)

N = 66

1560 (280)

<0.001

32

N = 75

1719 (319)

N = 75

2285 (624)*

N = 76

1810 (240)

N = 30

2322 (817)*

N = 88

1798 (196)

N = 81

1800 (384)

<0.001

33

N = 126

2017 (331)

N = 100

2406 (596)*

N = 81

1964 (253)

N = 33

2365 (541)*

N = 97

1975 (217)

N = 154

1930 (354)

<0.001

34

N = 156

2162 (358)

N = 168

2570 (510)*

N = 141

2145 (321)

N = 49

2386 (571)^b

N = 125

2128 (247)

N = 211

2224 (360)

<0.001

35

N = 323

2396 (329)

N = 290

2714 (534)*

N = 131

2429 (355)

N = 88

2652 (425)*

N = 154

2368 (294)

N = 281

2330 (435)

<0.001

36

N = 606

2661 (377)

N = 530

2825 (490)*

N = 321

2671 (404)

N = 219

2852 (480)*

N = 174

2620 (350)

N = 486

2770 (405)^c

<0.001

37

N = 1915

2854 (375)

N = 914

2889 (417)

N = 766

2918 (397)*

N = 496

2985 (423)*

N = 416

2830 (376)

N = 783

2990 (409)

<0.001

38

N = 6514

3096 (367)

N = 2114

2954 (398)*

N = 2208

3030 (382)*

N = 1155

3114 (381)

N = 938

3025 (342)*

N = 1926

3110 (387)*

<0.001

39

N = 7105

3213 (352)

N = 3658

3048 (376)*

N = 3730

3157 (362)*

N = 2020

3202 (391)

N = 1926

3112 (315)*

N = 2522

3245 (375)

<0.001

40

N = 5888

3332 (368))

N = 3969

3130 (385)*

N = 5004

3237 (366)*

N = 2311

3305 (383)

N = 2145

3192 (322)*

N = 2277

3347 (390)*

<0.001

41

N = 2573

3436 (384)

N = 2572

3169 (393)*

N = 2145

3316 (385)*

N = 1536

3381 (396)*

N = 1442

3227 (331)*

N = 1049

3430 (404)*

<0.001

42

N = 24

3394 (428)

N = 1329

3197 (405)

N = 1093

3334 (386)

N = 801

3401 (419)*

N = 752

3265 (341)

N = 207

3475 (415)

<0.001