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Table 2 Distribution of absolute frequency and association of socio-demographic, perinatal and neonatal characteristics on Infant Mortality in Porto Alegre (Rio Grande do Sul, Brazil) from 2000 to 2017

From: The influence of the municipal human development index and maternal education on infant mortality: an investigation in a retrospective cohort study in the extreme south of Brazil

  TOTAL
n(%)
DEATH
n(%)
RR [CI95%] Value of p
Maternal Age
 10 to 17 years 24,882 (7.8) 370 (1.5) 1.59[1.42–1.77] < 0.001
  ≥ 35 years 52,952 (16.7) 493 (0.9) 0.99 [0.90–1.09] 0.926
 18 to 34 years 239,706 (75.5) 2242 (0.9) 1  
Marital Status
 Single/Separated/Widowed 203,417 (64.2) 2317 (1.1) 1.69 [1.56–1.83] < 0.001
 Married/stable union 113,361 (35.8) 764 (0.7) 1  
Parity
 Primipara 142,143 (44.8) 1180 (0.8) 0.76 [0.71–0.82] < 0.001
 Multipara 174,796 (55.2) 1907 (1.1) 1  
Number of dead children
  ≥ 1 30,460 (9.6) 377 (1.2) 1.30 [1.17–1.45] < 0.001
 None 287,004 (90.4) 2727 (1.0) 1  
Number of Prenatal Care Consultations
 None 9713 (3.1) 457 (4.7) 9.45 [8.48–10.53] < 0.001
 From 1 to 3 25,711 (8.1) 668 (2.6) 5.22 [4.74–5.74] < 0.001
 From 4 to 6 65,898 (20.8) 874 (1.3) 2.66 [2.44–2.91] < 0.001
 7 and more 215,170 (68.0) 1071 (0.5) 1  
Birth
 Vaginal 170,220 (53.6) 1671 (1.0) 1.0 [0.94–1.08] 0.828
 Cesarean 147,320 (46.4) 1435 (1.0) 1  
Gestational Age
 Less than 27 weeks 1317 (0.4) 749 (56.9) 124.96 [116.31–134.25] < 0.001
 28 to 31 weeks 2631 (0.8) 397 (15.1) 33.15 [29.83–36.85] < 0.001
 32 to 36 weeks 26,244 (8.3) 587 (2.2) 4.91 [4.46–5.41] < 0.001
 37 weeks or more 286,735 (90.5) 1305 (0.5) 1  
Apgar at 5 min
  < 7 3587 (1.1) 940 (26.2) 41.19 [38.39–44.19] < 0.001
  ≥ 7 312,140 (98.9) 1986 (0.6) 1  
Low Weight
 No (≥2500 g) 290,659 (91.5) 1294 (0.4) 0.07 [0.06–0.07] < 0.001
 Yes (< 2500 g) 26,886 (8.5) 1813 (6.7) 1  
Congenital Anomaly
 Yes 4711 (1.5) 791 (16.8) 23.02 [21.34–24.83] < 0.001
 No 311,361 (98.5) 2271 (0.7) 1  
Newborn Sex
 Female 154,886 (48.8) 1411 (0.9) 0.88 [0.82–0.95] < 0.001
 Male 162,630 (51.2) 1680 (1.0) 1  
Type of Hospital
 Public 147,558 (46.6) 1774 (1.2) 3.50 [3.09–3.97] < 0.001
 Mixed 85,357 (27.0) 945 (1.1) 3.23 [2.83–3.69] < 0.001
 Private 83,456 (26.4) 286 (0.3) 1  
  1. Dependent variable: death. RR Relative risk, CI95% 95% confidence interval. n Number of participants. %: percentage. <: less