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Table 3 Estimates of prevalence (P), intracluster correlation coefficients (ICC), their respective 95% CI, design effect (Deff), and mean cluster size (n a ) for maternal socio-demographic characteristics

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
Household (rural) 9.8 0.097 0.034-0.159 32.9 264
Homeownership 57.5 0.041 0.012-0.070 15.2 265
Paved street 78.7 0.181 0.077-0.286 60.0 262
Piped water 94.2 0.090 0.031-0.149 30.0 263
Sewer 86.8 0.191 0.083-0.300 53.8 261
Family income (>US$ 400.00) 38.8 0.103 0.037-0.168 28.8 244
Paid work 42.6 0.036 0.010-0.063 10.8 263
Paid work in pregnancy 88.8 0.041 0.008-0.073 7.4 112
Strenuous work 43.4 0.037 0.006-0.068 5.5 99
Standing work 61.4 0.017 <0.001-0.034 2.8 99
Night work 19.5 0.033 0.004-0.061 4.3 98
Housework (alone) 50.7 0.019 0.004-0.034 7.3 265