Table 4

Estimates of prevalence, intraclass correlation coefficients, their respective 95% CI, design effect and the mean cluster size with respect to personal and obstetric data
Variable P (%) ICC 95% CI for ICC DEFF na
· Age (<30 years) 65.6 0.013 0.002−0.024 4.00 354
· Skin color (White) 42.5 0.285 0.127−0.443 146.55 264
· Schooling (Primary) 46.5 0.051 0.012−0.091 17.45 256
· Marital status (Has a partner) 53.2 0.176 0.066−0.286 101.96 298
· Weight (<75 kg) 52.3 0.055 0.010−0.101 21.45 167
· Height (<1.60 m) 48.6 0.054 0.007−0.101 13.51 151
· Body Mass Index (Low BMI) 15.4 0.053 0.006−0.100 18.47 146
· Number of pregnancies (One) 41.9 0.010 0.001−0.019 9.01 352
· Number of deliveries (None) 48.2 0.010 0.002−0.019 8.87 352
· Number of abortions (None) 77.6 0.005 <0.001−0.011 2.59 352
· Number of previous C-sections (None) 76.0 0.011 0.002−0.021 6.87 347
· Number of live births (None) 51.3 0.016 0.003−0.028 11.27 341
· Time since last delivery (≤2 years) 25.5 0.022 0.001−0.043 4.23 99
· Previous uterine surgery 2.0 0.067 0.017−0.117 20.52 299
· Number of prenatal visits (<6) 46.4 0.018 0.003−0.034 5.34 276
· Pregnant at admission 95.0 0.043 0.011−0.074 20.70 354
· Gestational age at admission (<37 weeks) 53.4 0.069 0.020−0.117 37.71 327
· Mode of onset of labor (no labor) 49.4 0.113 0.038−0.188 88.44 349
· Gestational age at resolution (<37 weeks) 45.7 0.055 0.015−0.095 31.28 309
· Mode of delivery (C-section before labor) 49.6 0.111 0.037−0.184 87.28 352
· Mode of onset of abortion (Spontaneous) 63.6 0.044 <0.001−0.141 1.52 8
· Total number of fetuses (None) 6.0 0.128 0.044−0.212 52.87 325
· Fetal presentation at birth (Cephalic) 91.3 0.011 0.001−0.020 4.77 273
· Some pathological or risky condition prior to this current pregnancy 48.9 0.115 0.038−0.191 47.12 305
· Chronic hypertension 17.7 0.046 0.012−0.079 15.98 305
· Obesity 24.1 0.110 0.036−0.184 65.40 305
· Low weight 0.3 0.004 <0.001−0.008 1.68 305
· Diabetes mellitus 2.5 0.023 0.005−0.041 7.84 305
· Smoking 5.7 0.065 0.018−0.111 44.05 305
· Cardiac diseases 2.9 0.025 0.006−0.045 9.23 305
· Respiratory diseases 2.8 0.018 0.004−0.033 9.67 305
· Renal diseases 1.2 0.038 0.010−0.067 11.74 305
· Sickle cell disease-thalassemia 0.8 0.005 <0.001−0.011 5.08 305
· HIV/AIDS 1.1 0.006 <0.001−0.013 3.16 305
· Thyroid disease 1.4 0.008 0.001−0.016 2.65 305
· Neurologic diseases/epilepsy 1.2 0.011 0.001−0.020 4.35 305
· Collagenosis 0.6 0.028 0.007−0.050 8.93 305
· Cancer 0.3 0.006 <0.001−0.012 2.31 305
· Other 5.2 0.037 0.009−0.065 13.99 305
· Drug addiction 1.2 0.005 <0.001−0.010 4.07 305

P: prevalence of each category; ICC: Intraclass Correlation Coefficient; 95% CI: 95% confidence interval; DEFF: Design effect; na: Mean cluster size.

Haddad et al.

Haddad et al. BMC Pregnancy and Childbirth 2012 12:101   doi:10.1186/1471-2393-12-101

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