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Table 2 Seventeen significantly higher and lower than expected proportions of FBD spatial clusters

From: Why not? Understanding the spatial clustering of private facility-based delivery and financial reasons for homebirths in Nigeria

 

ID

Cluster location

No. of wards circled

No. of most recent births

Observed number of private FBD

Observed % private FBD

Expected number of private FBD under H0

Relative risk+

p-value$

Latitude

Longitude

Radius (km)

High

1^

6.7

3.7

97.2

75

1182

605

52.8

154

4.82

< 0.001

2

9.9

8.9

21.2

5

63

33

50.5

8

4.06

< 0.001

3

5.8

7.2

85.2

88

1199

569

48.9

156

4.38

< 0.001

4

6.7

5.4

78.7

28

457

146

32.9

60

2.54

< 0.001

5

8.5

4.6

132.5

67

1198

338

28.0

156

2.34

< 0.001

6

7.3

9.0

79.4

12

249

73

27.4

32

2.29

< 0.001

7

7.9

7.1

148.3

78

1200

295

25.3

156

2.00

< 0.001

Low

8

9.8

9.7

64.0

8

233

8

3.1

30

0.26

0.014

9

5.3

8.6

75.9

17

280

8

2.9

37

0.22

< 0.001

10

4.6

5.7

88.6

24

558

5

2.1

73

0.07

< 0.001

11

8.7

11.6

178.0

41

1187

22

1.8

155

0.14

< 0.001

12

10.8

7.3

155.6

38

1174

14

1.4

153

0.09

< 0.001

13

10.8

3.9

184.8

24

770

7

0.5

100

0.07

< 0.001

14

13.3

8.0

144.9

31

1201

1

0.1

156

0.01

< 0.001

15

12.0

12.5

208.5

46

1197

2

0.1

156

0.01

< 0.001

16

11.7

9.3

84.7

30

1085

1

0.1

141

0.01

< 0.001

17

13.2

5.5

145.6

36

1201

0

0.0

156

0.00

< 0.001

  1. FBD = facility based delivery; H0 = null hypothesis of spatial randomness
  2. $The likelihood ratio test is used for testing cluster significance
  3. ^Cluster 1 is the most likely cluster; all other clusters are non-overlapping secondary clusters
  4. +Relative risk of private FBD within cluster compared to the risk in all other areas