Table 1 Estimates of prevalence (P), intracluster correlation coefficients (ICC), their respective 95% CI, design effect (Deff), and mean cluster size (n a ) for categorical maternal characteristics
Variables | P (%) | ICC | 95% CI for ICC | Deff | na |
|---|---|---|---|---|---|
Skin color (white) | 43.1 | 0.145 | 0.058-0.233 | 42.2 | 265 |
Marital status (with a partner) | 77.7 | 0.008 | <0.001-0.016 | 3.2 | 265 |
Schooling (>8 years) | 60.5 | 0.030 | 0.008-0.053 | 10.6 | 261 |
Children under 5 years (≥1) | 27.1 | 0.005 | <0.001-0.011 | 2.4 | 265 |
Time since last delivery (until 12 months) | 8.4 | 0.011 | <0.001-0.022 | 2.8 | 155 |
Previous cerclage | 1.1 | 0.001 | <0.001-0.004 | 1.2 | 264 |
Previous preterm birth | 17.3 | 0.007 | <0.001-0.013 | 3.2 | 264 |
Previous preterm birth of multiples | 1.0 | <0.001 | <0.001-0.003 | 1.2 | 264 |
Previous preterm labor | 7.4 | 0.011 | 0.001-0.021 | 4.3 | 264 |
Previous prelabor PROM | 7.2 | 0.002 | <0.001-0.006 | 1.8 | 264 |
Previous indicated preterm birth | 7.7 | 0.004 | <0.001-0.009 | 2.0 | 263 |
Previous newborn weight < 2500 g | 14.8 | 0.010 | <0.001-0.019 | 4.1 | 262 |
Previous chronic diseases: | |||||
● Chronic hypertension | 8.2 | 0.004 | <0.001-0.009 | 2.4 | 265 |
● Diabetes mellitus | 2.1 | 0.010 | 0.001-0.019 | 3.6 | 265 |
● Thyroid disease | 1.8 | 0.012 | 0.002-0.023 | 4.4 | 265 |
● Cardiac disease | 1.3 | 0.002 | <0.001-0.005 | 1.4 | 265 |
● Lung disease | 2.9 | 0.006 | <0.001-0.012 | 2.8 | 265 |
● Renal disease | 1.8 | 0.013 | 0.002-0.024 | 4.7 | 265 |
● Digestive disease | 1.3 | 0.009 | 0.001-0.018 | 3.3 | 265 |
● Hematological disease | 1.4 | 0.012 | 0.002-0.023 | 4.7 | 265 |
● Neurological disease | 1.2 | 0.008 | <0.001-0.016 | 3.7 | 265 |
● Psychiatric disease | 1.4 | 0.022 | 0.005-0.038 | 7.0 | 265 |
● HIV | 1.3 | 0.006 | <0.001-0.012 | 2.6 | 265 |
● Other | 6.5 | 0.033 | 0.009-0.057 | 11.8 | 265 |