Table 4. Crude and adjusted risks of low birth weight, according to caffeine consumption. Ribeirão Preto Birth Cohort of 2010.

Caffeine consumption	Crude Relative Risk	Adjusted Relative Risk
		Model 1	Model 2	Model 3	Model 4
	RR (95% CI)	RR1 (95% CI)	RR2 (95% CI)	RR3 (95% CI)	RR4 (95% CI)
Not consumed	1	1	1	1	1
< 300 mg/day	0.91 (0.77–1.06)	1.10 (0.93–1.32)	1.07 (0.91–1.27)	1.08 (0.91–1.27)	1.10 (0.92–1.32)
≥ 300 mg/day	1.45 (0.91–2.32)	1.52 (0.92–2.52)	1.56 (0.97–2.50)	1.34 (0.53–2.16)	1.42 (0.85–2.38)

Abbreviations: CI, confidence interval; RR, relative risk.

Model 1 adjusted for maternal age, education and skin color, marital status, and occupation of the head of the family.

Model 2 adjusted for parity, previous preterm birth, abortion, and stillbirth.

Model 3 adjusted for gestational hypertension and diabetes, threatened abortion and preterm delivery, alcohol consumption, maternal smoking, and urinary tract infection.

Model 4 adjusted for all variables included in the previous models.