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Table 8 Estimates of mean, intracluster correlation coefficients (ICC), their respective 95% CI, design effect (Deff), and mean cluster size (n a ) for numeric newborn outcome variables

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

Variable Mean ICC 95% CI for ICC Deff na
Gestational age (weeks) 34.5 0.031 0.008-0.055 10.4 265
Birth weight (g) 2321.1 0.033 0.009-0.058 11.6 264
Birth weight 2° twin (g) 1905.2 0.007 <0.001-0.043 1.4 21
APGAR 1st minute 7.3 0.032 0.008-0.056 8.6 261
APGAR 1st minute 2° twin 6.7 0.042 <0.001-0.098 2.2 21
APGAR 5th minute 8.6 0.041 0.012-0.070 11.5 261
APGAR 5th minute 2° twin 8.3 0.002 <0.001-0.034 1.1 21
Head circumference (cm) 31.7 0.031 0.008-0.055 10.1 236
Head circumference 2° twin (cm) 30.8 0.018 <0.001-0.067 1.1 18
Stature (cm) 44.3 0.031 0.007-0.054 10.3 237
Stature 2° twin (cm) 42.3 0.025 <0.001-0.077 1.4 18
Length of ICU stay (days) 8.4 0.088 0.028-0.148 21.4 220
Length of hospital stay (days) 13.3 0.037 0.009-0.065 8.5 235
Age of newborn at sepsis (days) 4.6 0.173 0.054-0.292 7.2 39
Age of newborn at death (days) 8.9 0.088 <0.001-0.179 2.7 17