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Table 7 Estimates of prevalence (P), intracluster correlation coefficients (ICC), their respective 95% CI, design effect (Deff), and mean cluster size (n a ) for categorical newborn outcome variables

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
Diagnosis of gestational age (US) 45.4 0.264 0.128-0.399 84.8 265
Stillborn 3.1 0.026 0.006-0.046 7.5 265
Intubation at delivery 13.4 0.013 0.002-0.024 4.1 248
Use of surfactant 12.6 0.015 0.002-0.027 4.4 245
Fetal malformation 9.5 0.078 0.026-0.130 19.6 246
Ventilatory support 42.6 0.041 0.011-0.070 15.1 249
Neonatal morbidity 60.3 0.126 0.047-0.205 33.4 248
   Sepsis 27.7 0.051 0.011-0.091 8.3 144
   Respiratory distress 73.4 0.061 0.014-0.107 9.9 148
   Pneumothorax 3.6 0.041 0.007-0.075 8.2 141
   Cerebral hemorrhage (1–4) 8.7 0.052 0.007-0.097 5.8 114
   Lung hemorrhage 3.7 0.028 0.004-0.053 5.7 143
   Hematologic dysfunction 51.0 0.267 0.116-0.417 71.7 146
   Endocrine dysfunction 22.0 0.119 0.036-0.201 30.3 145
   Renal dysfunction 6.4 0.013 <0.001-0.027 3.5 145
   Immune dysfunction 6.5 0.092 0.025-0.158 22.1 145
   Musculoskeletal morbidity 8.6 0.190 0.071-0.310 38.4 146
   Gastrointestinal dysfunction 43.2 0.340 0.168-0.512 70.6 146
   Hypovolemia 10.4 0.026 0.003-0.049 6.0 146
   Necrotizing enterocolitis 2.4 0.020 0.001-0.038 3.2 145
   Convulsion/anticonvulsants 4.8 0.039 0.007-0.071 6.7 146
   Vasoactive amines 12.2 0.019 0.001-0.037 3.5 146
   Pneumonia 5.6 0.118 0.036-0.200 15.6 145
   Oxygen therapy with 28 days 8.0 0.021 0.002-0.041 3.8 145
   Oxygen therapy with 56 days 2.9 0.012 <0.001-0.025 2.8 143
   Degree of retinopathy (1–3) 4.8 0.028 <0.001-0.056 4.2 99
Condition at discharge (live) 91.8 0.014 0.002-0.026 4.1 252