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Table 1 Characteristics of ‘low risk’ women and their babies by planned place of birth and parity

From: A comparison of intrapartum interventions and adverse outcomes by parity in planned freestanding midwifery unit and alongside midwifery unit births: secondary analysis of ‘low risk’ births in the birthplace in England cohort

 

Nulliparous

Multiparous

FMU

AMU

FMU

AMU

n = 5187

n = 8350

n = 6078

n = 8323

n

%

n

%

n

%

n

%

Maternal age

 Mean (SD)

27.0

(5.69)

26.9

(5.59)

30.3

(5.39)

29.7

(5.38)

 Under 20

578

11.2

906

10.9

98

1.6

158

1.9

 20-24

1243

24.0

2064

24.8

886

14.6

1414

17.0

 25-29

1538

29.7

2552

30.6

1720

28.3

2442

29.4

 30-34

1314

25.4

2002

24.0

1930

31.8

2572

31.0

 35-39

460

8.9

755

9.1

1230

20.3

1472

17.7

 40+

47

0.9

56

0.7

207

3.4

242

2.9

 Missing

7

 

15

 

7

 

23

 

Ethnic group

 White

4779

92.2

6930

83.2

5533

91.1

6523

78.5

 Indian

46

0.9

266

3.2

41

0.7

243

2.9

 Pakistani

57

1.1

180

2.2

107

1.8

364

4.4

 Bangladeshi

42

0.8

45

0.5

105

1.7

85

1.0

 Black Caribbean

24

0.5

104

1.2

24

0.4

94

1.1

 Black African

38

0.7

191

2.3

56

0.9

328

3.9

 Mixed

61

1.2

143

1.7

63

1.0

150

1.8

 Other

138

2.7

470

5.6

146

2.4

522

6.3

 Missing

2

 

21

 

3

 

14

 

Understanding of English

 Fluent

5014

96.8

7633

91.8

5896

97.3

7530

90.8

 Some

142

2.7

560

6.7

131

2.2

613

7.4

 None

22

0.4

126

1.5

33

0.5

148

1.8

 Missing

9

 

31

 

18

 

32

 

Marital/Partner status

 Married/Living together

4608

89.9

7241

88.0

5821

96.7

7745

94.4

 Single/Unsupported

519

10.1

985

12.0

199

3.3

461

5.6

 Missing

60

 

124

 

58

 

117

 

Body mass index (kg/m 2 )

 Mean (SD)

23.7

(3.54)

23.6

(3.66)

24.4

(3.82)

24.4

(3.85)

 Not recorded

889

17.2

1432

17.2

972

16.0

1483

17.9

 10-18.4

121

2.3

243

2.9

113

1.9

194

2.3

 18.5-24.9

2738

52.8

4419

53.1

2858

47.1

3783

45.7

 25.0-29.9

1098

21.2

1713

20.6

1550

25.5

2071

25.0

 30.0-35.0

336

6.5

521

6.3

575

9.5

748

9.0

 Missing

5

 

22

 

10

 

44

 

Index of Multiple Deprivation (IMD) quintiles

 1st Least deprived

1090

21.1

1241

14.9

1405

23.2

1293

15.6

 2nd

1180

22.8

1357

16.3

1399

23.1

1281

15.4

 3rd

1094

21.2

1687

20.3

1206

19.9

1548

18.7

 4th

965

18.7

1984

23.8

1111

18.3

1860

22.4

 5th Most deprived

843

16.3

2058

24.7

941

15.5

2316

27.9

 Missing

15

 

23

 

16

 

25

 

Previous pregnancies > =24 completed weeks

 0 Nulliparous

5187

100.0

8350

100.0

N/A

N/A

N/A

N/A

 1 previous

N/A

N/A

N/A

N/A

3913

64.4

5621

67.5

 2 previous

N/A

N/A

N/A

N/A

1513

24.9

1933

23.2

 3+ previous

N/A

N/A

N/A

N/A

652

10.7

769

9.2

Gestation (completed weeks)

 Mean (SD)

39.8

(1.1)

39.7

(1.1)

39.8

(1.1)

39.7

(1.1)

 37

149

2.9

257

3.1

165

2.7

216

2.6

 38

473

9.1

798

9.6

505

8.3

766

9.2

 39

1155

22.3

1995

24.0

1512

24.9

2130

25.7

 40

1965

38.0

3178

38.2

2392

39.4

3302

39.8

 41

1379

26.7

1982

23.8

1439

23.7

1814

21.8

 42-44

51

1.0

119

1.4

57

0.9

76

0.9

 Missing

15

 

21

 

8

 

19

 

Birthweight (grams)

 Mean (SD)

3415

(420.0)

3405

(423.2)

3549

(439.3)

3519

(441.7)

 1000-2499 g

57

1.1

109

1.3

43

0.7

50

0.6

 2500-2999 g

725

14.0

1237

14.9

597

9.8

897

10.8

 3000-3499 g

2265

43.7

3581

43.0

2163

35.6

3171

38.2

 3500-3999 g

1676

32.3

2675

32.1

2342

38.6

3001

36.1

 4000-4499 g

417

8.0

665

8.0

828

13.6

1034

12.5

 4500-7500 g

46

0.9

56

0.7

100

1.6

149

1.8

 Missing

1

 

27

 

5

 

21

 
  1. SD standard deviation
  2. Data in bold emphasized the main headings and sub-headings