Table 3.

Logistic regression models: Results for the association of preterm birth and low birth weight outcomes and the exposure variables

Characteristic	MODEL 1			MODEL 2
	Preterm birth			Low birth weight
	OR	95% CI		OR	95% CI
Mother´s origin
Colombia	1.00			1.00
Venezuela	1.22	0.98	1.51	1.27	1.01	1.58
Maternal age groups (years)
20–34	1.00			1.00
10–19	1.18	1.15	1.21	1.11	1.08	1.14
≥ 35	1.16	1.13	1.19	1.22	1.19	1.26
Maternal education
No formal education/ Primary schooling	1.00			1.00
Secondary schooling	0.97	0.94	1.00	0.90	0.88	0.93
Technical and technological	0.95	0.91	0.98	0.82	0.80	0.85
Professional level and higher	0.86	0.83	0.90	0.68	0.66	0.71
Marital status
Married or living with the partner	1.00			1.00
Single/divorced/widow	1.14	1.11	1.17	1.18	1.15	1.21
Number of previous pregnancies
2–4	1.00			1.00
1	0.81	0.78	0.84	0.89	0.85	0.92
> 5	1.21	1.16	1.26	1.11	1.06	1.16
Interbirth period
25–60 months	1.00			1.00
< 24 months/ 2 years	1.37	1.32	1.42	1.27	1.21	1.32
> 61 months	1.07	1.03	1.10	1.09	1.06	1.13
No previous birth	1.37	1.31	1.43	1.61	1.55	1.69
Birth region
Bogotá and Cundinamarca	1.00			1.00
Central	0.76	0.75	0.79	0.61	0.59	0.63
Caribbean and Islands	0.80	0.77	0.81	0.53	0.52	0.55
Oriental	0.68	0.66	0.70	0.48	0.47	0.50
Pacific	0.81	0.79	0.83	0.61	0.59	0.63
Amazonian and Orinoquia	0.44	0.40	0.50	0.27	0.23	0.30
Multiple birth
No	1.00			1.00
Yes	16.36	15.50	17.26	19.80	18.74	20.91
Newborn´s sex
Female infant	1.00			1.00
Male infant	0.93	0.91	0.94	1.21	1.19	1.23
Mode of birth
Vaginal birth	1.00			1.00
Cesarean section	1.73	1.70	1.76	1.76	1.73	1.80

Models adjusted for: maternal age, education level, marital status, number of previous pregnancies, interbirth period, birth region, multiple birth, mode of birth and newborn´s sex

OR (Odds Ratio) and 95% Confidence Interval (95% CI)