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Table 1 Summary statistics of the abdominal circumference and estimated fetal weight at each completed gestational week

From: Unconditional and conditional standards for fetal abdominal circumference and estimated fetal weight in an ethnic Chinese population: a birth cohort study

Completed gestational week

Abdominal circumference (mm)

Estimated fetal weight (gram)

Both Genders Pooled

Male

Female

Both Genders Pooled

Male

Female

N

Mean

SD

N

Mean

SD

N

Mean

SD

N

Mean

SD

N

Mean

SD

N

Mean

SD

18

10

133

7

8

134

8

2

131

2

9

244

25

7

243

26

2

250

26

19

81

142

7

38

144

7

43

140

7

80

288

26

37

295

29

43

282

23

20

148

153

7

79

154

6

69

151

7

146

344

32

79

348

31

67

340

32

21

57

161

8

35

163

6

22

158

9

55

393

37

33

403

29

22

379

43

22

5

158

7

1

151

--

4

160

7

4

408

43

0

--

--

4

408

43

24

3

201

4

2

202

6

1

199

--

3

748

14

2

743

16

1

758

--

25

17

207

11

8

206

10

9

207

12

16

787

78

7

777

79

9

794

82

26

120

215

10

67

217

9

53

213

10

118

894

83

66

903

84

52

883

81

27

122

223

9

62

225

8

60

221

9

121

1005

98

62

1023

97

59

986

98

28

36

233

11

20

235

10

16

232

12

36

1132

128

20

1139

109

16

1123

151

29

8

245

9

6

248

8

2

238

8

8

1281

105

6

1331

57

2

1130

6

30

3

251

5

1

254

--

2

250

6

2

1452

97

1

1521

--

1

1384

--

31

23

269

12

12

268

15

11

270

8

21

1744

164

10

1715

198

11

1771

130

32

151

279

12

80

280

12

71

278

13

151

1898

189

80

1922

186

71

1871

189

33

116

287

13

63

289

11

53

284

14

112

2063

207

62

2101

192

50

2016

218

34

15

295

10

9

299

7

6

289

12

15

2239

201

9

2308

162

6

2134

223

35

5

305

21

2

288

11

3

316

18

4

2458

429

2

2156

204

2

2761

381

  1. N number of measurements, SD standard deviation