Table 5.

Risk factors related to UCIP admission. Univariate and multivariable logistic regression analysis

	Univariable analysis			Multivariable analysis
	OR	95% CI	P value	OR	95% CI	P value
Sex (male)	1.018	0.653–1.586	0.937
Gestational age (weeks)	0.893	0.820–0.973	0.009	0.978	0.871–1.099	0.405
Birth weight (g)	1	0.999–1	0.348
Weight at admission (Kg)	0.749	0.649–0.864	< 0.001	0.821	0.704–0.957	0.012
Age (months)	0.914	0.849–0.985	0.018	1.088	0.971–1.219	0.147
Underlying disease	1.541	0.728–3.261	0.259
Prematurity	1.590	0.898–2.814	0.112	0.683	0.245–1.906	0.464
Caesarean section	1.629	1.032–2.572	0.036	1.782	1.060–2.997	0.029
Personal history atopy	1.165	0.523–2.594	0.709
Apnea	47.402	10.96–205.1	< 0.001	38.16	8.466–172	< 0.001
Sepsis	1.971	0.463–8.388	0.359
Breastfeeding	1.339	0.849–2.112	0.210
RSV	2.790	1.460–5.332	0.002	3.072	1.470–6.423	0.003
Rhinovirus/enterovirus	0.665	0.411–1.076	0.096	0.775	0.381–1.579	0.484
Coronavirus	1.129	0.531–2.401	0.753
Bocavirus	1.357	0.649–2.838	0.418
Parainfluenza	0.557	0.210–1.481	0.241
Human Metapneumovirus	1.024	0.398–2.635	0.961
Adenovirus	0.858	0.278–2.644	0.790
Infuenza	1.657	0.606–4.528	0.325
Viral coinfection	1.151	0.737–1.797	0.536
†Viral coinfection
None			0.291			0.188
2 Virures ≥ 3 Viruses	0.979 1.661	0.589–1.626 0.857–3.220	0.934 0.133	0.937 1.843	0.525–1.674 0,879–3.864	0.560 0.068

OR and 95% CI are from Logistic regression analysis. Bold indicates statistical significance (P < 0.05)

RSV Respiratory syncytial virus

† Viral coinfection: Reference group = none