Table 2. Age, weight and length of hospitalization as a risk factors for acquisition of nosocomial colonization in neonatal intensive care units.

		Number	Mean	SD	95% confidence interval for mean		P value
					Lower bound	Upper bound
Age (days)	CoNS positive	50	10.5	10.2	1.7	5.8	<0.001*
	No growth	50	3.8	7.1	7.6	13.4
Weight (Kg)	CoNS	50	2.4	782.3	2086.5	2535.1	0.716
	No growth	50	2.3	789. 4	2145.9	2590.5

^*p value <0.05 is considered significant by independent sample t-test.

CoNS – coagulase-negative staphylococci.