Table 3.

Birth weight-related outcomes of infants born in the Jundiaí Zika Cohort from March 2016 to August 2017, Jundiaí, São Paulo, Brazil.

	Birth weight	ZIKV exposed (n = 44)	ZIKV unexposed (n = 513)	Crude RR (95% CI)
Birthweight	VLBW (< 1,500 g)	1 (2.3%)	10 (1.9%)	1.2 (0.2–8.9)
	LBW (1,500–2,499 g)	3 (6.8%)	47 (9.2%)	0.7 (0.24–2.3)
	Normal (2,500–4,000 g)	39 (88.6%)	435 (84.8%)	1.0 (0.9–1.2)
	Large (> 4,000 g)	1 (2.3%)	21 (4.1%)	0.6 (0.1–4.0)
	Total LBW	4 (9.1%)	57 (11.1%)	0.8 (0.3–2.1)
SGA	Extreme SGA (z-score <  − 1.88)	2 (4.5%)	15 (2.9%)	1.6 (0.4–6.6)
	SGA (− 1.88 < z-score <  − 1.28)	2 (4.5%)	36 (7.0%)	0.6 (0.2–2.6)
	Not SGA	40 (90.9%)	463 (90.3%)	1.0 (0.9–1.1)
	Total SGA	4 (9.1%)	50 (9.7%)	0.9 (0.4–2.5)

VLBW very low birth weight, LBW low birth weight, SGA small for gestational age (birth weight < − 1.28 z-scores).