Skip to main content

Table 1 Absolute (n) and relative (%) frequencies of categories in variables under study

From: Causal effects on low Apgar at 5-min and stillbirth in a malaria maternal–fetal health outcome investigation: a large perinatal surveillance study in the Brazilian Amazon

Variables studied Categories n (%)
Outcomes
 Low Apgar at 5-min Score < 7 75 (2.7)
Score ≥ 7 2732 (97.3)
 Stillbirth Yes 23 (0.8)
No 2784 (99.2)
Maternal pregnancy and health characteristics
 Advanced age or young > 35 years or < 15 years 298 (10.6)
15–35 years 2509 (89.4)
 Number of previous deliveries 1–4 deliveries 1443 (51.4)
Otherwise 1364 (48.6)
 Attended ≥ 6 obstetrics consults during pregnancy ≥ 6 consults 2036 (72.8)
Otherwise 760 (27.2)
Missing data 11
 Diagnosed with perinatal anaemia Hgb < 11 g/dL 1144 (41.2)
Otherwise 1635 (58.8)
Missing data 28
 Presented with perinatal fever Yes 142 (5.1)
No 2655 (94.9)
Missing data 10
 Diagnosed with malaria prior to current pregnancy Yes 1265 (45.1)
No 1539 (54.9)
Missing data 3
 Diagnosed with malaria during pregnancy P. vivax only 108 (3.85)
P. falciparum or mixed (falc + viv) 94 (3.35)
No malaria 2605 (92.8)
 Diagnosed with perinatal malaria Yes 27 (1)
No malaria 2605 (99)
Missing data 175
 No malaria testing during pregnancy Testing not done 564 (20.1)
Testing done 2243 (79.9)
Maternal malaria risk factors
 Resides in Cruzeiro do Sul Cruzeiro do Sul 1578 (56.2)
Otherwise 1229 (43.8)
 Resides in rural area Rural 1522 (54.5)
Urban 1270 (45. 5)
Missing data 15
 Illiterate or has secondary education as highest level Illiterate or secondary 1072 (38.2)
High school or college 1734 (61.8)
Missing data 1
 Never used repellent in pregnancy Not used 684 (24.4)
Used in any trimester 2123 (75.6)
 Never used a bed net during pregnancy Not used 1078 (38.4)
Used in any trimester 1779 (61.6)
 No air conditioning unit in home No air conditioning 2333 (83.1)
With air conditioning 474 (16.9)
Newborn health at delivery
 Born prematurely (in gestational age) < 37 weeks 203 (7.3)
≥ 37 weeks 2570 (92.7)
 Low birth weight at delivery (g) < 2500 g 212 (7.5)
≥ 2500 g 2595 (92.5)
 Low head circumference (cm) < 33 cm 342 (12.2)
≥ 33 cm 2456 (87.8)
Control variable
 Haemoglobin blood test timing Before delivery 1795 (64.8)
After delivery 977 (35.2)
Missing data 35