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Table 1 Characteristics of 46,610 mother-child dyads

From: Prevalence of congenital microcephaly and its risk factors in an area at risk of Zika outbreaks

Characteristics

Mean (SD)

n (%)

Maternal age

30.2 (4.7)

 

 < 35 years old

 

39,019 (83.7)

Primiparous

 

19,534 (41.9)

Hypertensive disorders of pregnancy

 

1493 (3.2)

Gestational diabetes

 

6787 (14.6)

Maternal carrier of HBVa

 

2189 (7.5)

Sex of newborns (Male)

 

24,927 (53.5)

Gestational age at birth, weeks

39.0 (1.5)

 

 Preterm birth

 

2590 (5.6)

Birth weight of newborns, kg

3.2 (0.4)

 

Birth weight for gestational age of newborns, Z-scoreb

0.0 (0.9)

 

 Small for gestational agec

 

3265 (7.0)

Head circumference of newborns, cm

33.3 (1.3)

 

Head circumference of newborns, Z-scoreb

−0.3 (1.0)

 

 < −3.0

 

154 (0.3)

 ≥ −3.0 & < −2.0

 

1777 (3.8)

BWHC Z-score differenced

−0.3 (0.8)

 

 < −3.0

 

58 (0.1)

 ≥ −3.0 & < −2.0

 

987 (2.1)

  1. HBV Hepatitis B Virus, SD Standard deviation, BWHC Birth weight and head circumference of newborns
  2. aAnalyzed among the births born in two campuses of Guangzhou Women and Children’s Medical Center (n = 29,493)
  3. bCalculated according to the INTERGROWTH-21st standards
  4. cDefined as gestational age and sex-adjusted birth weight < 10th percentile based on the INTERGROWTH-21st newborn size standard
  5. dDefined as the difference between head circumference Z-score and birth weight Z-score of newborns