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Table 9 Estimates of prevalence (P), intracluster correlation coefficients (ICC), their respective 95% CI, design effect (Deff), and mean cluster size (n a ) for categorical management variables in spontaneous labor conditions or preterm due to pPROM

From: Intracluster correlation coefficients for the Brazilian Multicenter Study on Preterm Birth (EMIP): methodological and practical implications

Variable

P(%)

ICC

95% CI for ICC

Deff

na

Preterm birth due to spontaneous labor:

     

Use of corticosteroids

28.5

0.032

0.002-0.062

5.2

73

Corticosteroids (betamethasone)

86.4

0.851

0.754-0.948

18.8

21

Use of tocolytic agents

23.6

0.068

0.015-0.121

8.7

72

Association of tocolytic agents

9.9

0.368

0.167-0.570

8.4

17

Therapeutic failure of tocolysis

11.4

0.165

0.029-0.301

4.3

17

Use of magnesium sulphate (neuroprotection)

3.9

0.070

0.016-0.125

9.3

70

Use of antibiotics

42.8

0.262

0.117-0.407

28.8

72

Intravenous antibiotic

93.3

0.321

0.127-0.515

10.1

31

Association of antibiotic

15.3

0.144

0.025-0.263

12.9

30

Group B streptococcus screening

24.3

0.286

0.131-0.442

26.2

65

Preterm birth due to pPROM:

     

Use of corticosteroids

40.5

0.042

0.002-0.083

3.7

53

Corticosteroids (betamethasone)

85.0

0.965

0.941-0.990

23.5

21

Use of tocolytic agents

17.7

0.547

0.364-0.729

38.3

56

Use of antibiotics

78.2

0.233

0.095-0.371

18.3

54

Intravenous antibiotic

91.0

0.366

0.180-0.552

14.4

41

Association of antibiotic

20.9

0.245

0.093-0.397

20.1

41

Group B streptococcus screening

36.3

0.441

0.260-0.622

27.9

50

Hydration solution (saline)

11.0

0.419

0.235-0.602

20.1

52