Table 3:

Adverse neonatal outcomes among small-for-gestational-age (SGA) infants in nonimmigrant and immigrant groups according to whether weight classification was defined by Canadian birth-weight curve or by world region–specific birth-weight curves

Outcome	SGA according to Canadian curve				SGA according to world region–specific curves
	Nonimmigrants n = 82 257	Immigrants n = 54 211	Immigrants v. nonimmigrants		Immigrants n = 33 780	Immigrants v. nonimmigrants
	No. of events (rate per 1000)	No. of events (rate per 1000)	Crude OR (95% CI)	Adjusted OR* (95% CI)	No. of events (rate per 1000)	Crude OR (95% CI)	Adjusted OR* (95% CI)
Neonatal death
All infants	653 (7.9)	366 (6.8)	0.85 (0.75–0.97)	0.83 (0.72–0.95)	343 (10.2)	1.28 (1.12–1.46)	1.24 (1.08–1.42)
Preterm infants (23–36 wk)	551 (67.8)	286 (63.9)	0.94 (0.81–1.09)	0.93 (0.80–1.09)	278 (77.8)	1.16 (1.00–1.35)	1.15 (0.99–1.35)
Term infants (37–41 wk)	102 (1.4)	80 (1.6)	1.17 (0.87–1.57)	1.18 (0.87–1.59)	65 (2.2)	1.57 (1.15–2.14)	1.56 (1.13–2.15)
Hospital stay ≥ 7 d	6 762 (82.2)	3 922 (72.3)	0.87 (0.83–0.91)	0.84 (0.80–0.87)	3 239 (97.4)	1.18 (1.13–1.24)	1.13 (1.08–1.18)
Admission to NICU	15 586 (189.5)	10 874 (200.6)	1.08 (1.05–1.10)	1.03 (1.00–1.06)	8 116 (240.3)	1.35 (1.31–1.40)	1.29 (1.25–1.33)
Mechanical ventilation	5 010 (60.9)	2 344 (43.2)	0.70 (0.66–0.74)	0.69 (0.65–0.72)	2 037 (60.3)	0.99 (0.94–1.04)	0.96 (0.91–1.02)
Intrauterine hypoxia or birth asphyxia	827 (10.1)	394 (7.3)	0.72 (0.64–0.81)	0.72 (0.64–0.82)	293 (8.7)	0.86 (0.75–0.99)	0.85 (0.74–0.98)

Note: CI = confidence interval, NICU = neonatal intensive care unit, OR = odds ratio.

^*Adjusted for maternal age, parity, income quintile and year of delivery.