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. 2014 Apr 22;14:54. doi: 10.1186/1471-2288-14-54

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

Variable Mean ICC 95% CI for ICC Deff n a
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