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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