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Table 6 Estimates of prevalence (P), intracluster correlation coefficients (ICC), their respective 95% CI, design effect (Deff), and mean cluster size (n a ) for categorical variables of process during labor

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
Mode of onset of labor (spontaneous) 55.3 0.018 0.004-0.032 6.5 265
Intrapartum antibiotic (ATB) 51.8 0.194 0.084-0.304 71.8 260
   ATB for fever 0.5 0.003 <0.001-0.008 1.8 252
   ATB for GBS colonization 1.9 0.019 0.004-0.034 5.6 252
   ATB for risk factor to GBS 20.0 0.148 0.058-0.238 48.2 252
   ATB for other reasons 29.1 0.384 0.217-0.550 148.0 252
Analgesics during labor:      
   Epidural 4.2 0.200 0.087-0.313 43.3 259
   Epidural plus spinal anesthesia 3.7 0.201 0.088-0.314 74.3 259
   Spinal anesthesia 20.1 0.338 0.181-0.495 112.8 259
   Meperidine 0.8 0.018 0.004-0.033 6.6 259
   Tramadol 0.2 0.002 <0.001-0.006 1.4 259
   Benzodiazepines 0.1 0.008 <0.001-0.017 3.6 259
   Antispasmodics 2.2 0.071 0.023-0.119 21.2 259
   Oral analgesics 2.0 0.091 0.031-0.150 23.0 259
   Other analgesics 2.4 0.102 0.036-0.168 46.6 259
Mode of delivery (vaginal) 48.8 0.024 0.006-0.043 7.7 265
Episiotomy 38.7 0.176 0.068-0.283 31.5 126
Forceps 3.9 0.056 0.014-0.099 12.9 116
Cesarean indication:      
   Fetal distress 25.7 0.016 0.001-0.031 3.8 133
   Cephalic-pelvic disproportion 2.8 0.016 0.001-0.032 3.2 133
   Two or more cesarean scars 9.8 0.006 <0.001-0.014 2.0 133
   Pelvic or other abnormal fetal presentation 15.6 0.012 <0.001-0.025 2.9 133
   Functional dystocia 2.2 0.022 0.003-0.041 3.8 133
   Diabetes 1.8 0.013 <0.001-0.027 3.3 133
   Arterial hypertension 22.7 0.043 0.011-0.075 7.4 133
   Cardiac disease 0.6 0.009 <0.001-0.020 1.6 133
   HIV 1.6 0.005 <0.001-0.012 1.7 133
   Placenta previa 2.0 0.006 <0.001-0.014 1.6 133
   Abruptio placentae 4.8 0.005 <0.001-0.013 1.9 133
   Uterine rupture 0.1 0.006 <0.001-0.015 1.1 133
   Fetal malformation 3.2 0.133 0.051-0.215 18.9 133
   Fetal macrosomia 1.7 0.002 <0.001-0.008 1.4 133
   Maternal choice 1.0 0.037 0.008-0.065 7.2 133
   Other 17.1 0.082 0.027-0.137 14.9 133
Type of incision (segmental transverse) 96.3 0.193 0.081-0.304 13.5 126