Table 3.

Controlled logistic regressions between newborn outcomes and the independent social variables for the Swiss population, regular migrants, and irregular migrants

	SGA (n = 850,411)			PTB (n = 850,411)			LBW (n = 993,856)			VLBW (n = 993,856)			Any AO (n = 850,288)
	aOR	[95% CI]	p	aOR	[95% CI]	p	aOR	[95% CI]	p	aOR	[95% CI]	p	aOR	[95% CI]	p
Residency
Swiss resident	1 (ref.)			1			1			1			1
Irregular migrant	0.76	0.68-0.85	0.0	1.18	1.05–1.32	0.004	0.95	0.85-1.06	0.375	1.43	1.13–1.81	0.003	0.90	0.83-0.99	0.022
Regular migrant	0.93	0.91-0.94	0.0	0.93	0.92-0.95	0	0.92	0.91-0.94	0.0	1.08	1.04–1.14	0.00	0.92	0.91-0.94	0.0
Parity
One	1 (ref.)			1			1			1			11
Two	0.60	0.59-0.61	0	0.90	0.88-0.91	0	0.82	0.80-0.83	0	0.88	0.84-0.92	0	0.68	0.67-0.69	0
Three	0.54	0.52-0.55	0	1.05	1.02–1.08	0	0.93	0.91-0.95	0	1.02	0.95-1.09	0.653	0.70	0.68-0.71	0
4 + children	0.53	0.51-0.56	0	1.34	1.28–1.39	0	1.10	1.05–1.15	0	1.20	1.08–1.34	0.001	0.80	0.78-0.83	0
Maternal civil status
Married	1(ref.)			1			1			1			1
Not married	1.23	1.21–1.25	0	1.10	1.08–1.12	0	1.23	1.21–1.26	0	1.42	1.36–1.50	0	1.19	1.18–1.21	0
Canton of childbirth
Other cantons	1 (ref.)			1			1			1			1
Geneva	1.08	1.05–1.11	0	1.33	1.29–1.38	0	1.45	1.41–1.50	0	1.86	1.72–2.03	0	1.19	1.16–1.22	0
Vaud	1.21	1.19–1.24	0	1.24	1.21–1.28	0	1.37	1.34–1.41	0	1.96	1.84–2.10	0	1.22	1.20–1.24	0
Zurich	0.92	0.90-0.93	0	1.11	1.09–1.14	0	1.11	1.09–1.14	0	1.52	1.43–1.61	0	0.99	0.97 − 1.00	0.139
Basel	0.98	0.94-1.02	0.248	1.36	1.31–1.42	0	1.40	1.35–1.46	0	2.68	2.46–2.93	0	1.12	1.09–1.16	0
Bern	1.03	1.01–1.05	0.010	1.18	1.15–1.21	0	1.24	1.21–1.27	0	2.03	1.90–2.15	0	1.09	1.07–1.11	0

Source: Federal Statistical Office (FSO) for its Vital Statistics (BEVNAT). AO Adverse Outcome, SGA Small for Gestational Age, LBW Low Birth Weight, VLBW Very Low Birth Weight, PTB Preterm Birth, EU European Union, EFTA European Free Trade Association, CH Switzerland

Note: the models were run differently according to the availability of the data