Table 2. Risk factors^* for MRSA acquisition.

(No./total) or medians with	Colonized	Not Colonized	Univariate logistic regression		Multivariate logistic regression
interquartile range	(N = 32)	(N = 67)	OR (95% CI)	p-value	OR (95% CI)	p-value
Gender (male)	53% (17/32)	52% (35/67)	1.04 (0.45–2.41)	1
Gestational age (days)	249 (228–266)	262 (226–279)	1.00 (0.98–1.01)	0.27
Birth weight (grams)	2729 (1742–3519)	2490 (1800–3280)	1.00 (1.00–1.00)	0.69
Hospital of birth (Glostrup)	56% (18/32)	54% (36/67)	1.11 (0.47–2.59)	0.83
Caesarean section	53% (17/32)	30% (20/67)	2.66 (1.12–6.35)	0.03	3.74 (1.27–11.0)	0.016
Twins or triplets	41% (13/32)	24% (16/67)	2.18 (0.89–5.37)	0.10	1.48 (0.37–5.87)	0.6
nCPAP treatment	66% (21/32)	27% (18/67)	5.20 (2.10–12.88)	<0.001	5.88 (1.67–20.7)	0.006
Transferred from tertiary care centre NICU	9% (3/32)	23.9% (16/67)	0.33 (0.09–1.23)	0.11	0.07 (0.006–1.27)	0.09
Chronic lung disease	6% (2/32)	3% (2/67)	2.17 (0.29–16.12)	0.59
Intravascular devices	59% (19/32)	45% (30/67)	1.80 (0.77–4.24)	0.20	0.89 (0.20–3.95)	0.9
Treatment with antibiotics	44% (14/32)	30% (20/67)	1.83 (0.76–4.38)	0.18	1.44 (0.33–6.37)	0.6
Days hospitalized	12.5 (7.25–34)	9 (4–27)	1.01 (0.99–1.03)	0.19	0.99 (0.93–1.05)	0.8
MRSA exposure in days	12.5 (7.25–34)	8 (4–17)	1.03 (1.00–1.05)	0.04	3.11 (0.40–24.6)#	0.28

^*Data with a p-value of 0.2 or less were tested in the multivariate analysis.

^#Period of MRSA exposure was logarithmically transformed in the multivariate (Logistic Regression) analysis.