Table 2. Description of mean, median, standard deviation and correlation between the variables and the number of invasive procedures performed on newborns admitted to the Neonatal Intensive Care Unit. São Paulo, SP, Brazil, 2013-2014.

Variables			Invasive procedures			F	P value†
			Mean	SD*	Median
Ventilation
	Spontaneous					170.8	<0.001
		Yes	4.60	3.62	4
		No	8.60	4.52	8
	CPAP ‡					1.4	0.231
		Yes	6.89	3.95	6
		No	6.47	4.92	5
	Mechanical					334.2	<0.001
		Yes	10.25	4.52	10
		Noo	4.81	3.33	4
NIPS‡ >0						7.1	0.008
		Yes	7.90	4.86	7
		No	6.50	4.49	6
Nursing notes
	Agitation				6	0.8	0.377
		Yes	7.10	4.25	6
		No	6.59	4.59	6
	Crying					4.1	0.044
		Yes	5.57	4.14	4
		No	6.75	4.59	6
	Expression of pain					0.8	0.809
		Yes	7.00	2.92	8
		No	6.63	4.58	6
Use of analgesic or sedative regardless of procedures performed
	Continuous					125.4	<0.001
		Yes	10.77	4.93	10
		No	5.89	4.07	5
	Intermittent					5.5	0.019
		Yes	7.60	4.53	7
		No	6.47	4.55	6
	PRN || ou OMC ¶					90.7	<0.001
		Yes	8.62	4.84	8
		No	5.46	3.95	5
Specific non-pharmacological intervention						0.129	0.720
		Yes	7.43	4.65	6
		No	6.80	4.55	6
Specific pharmacological intervention
		Yes	6.91	4.44	6	0.018	0.893
		No	6.80	4.63	6

*SD: standard-deviation; † ANOVA model; ‡CPAP: Continuous Positive Airway Pressure; §NIPS: Neonatal Infant Pain Scale; ||PRN: Pro Re Nata; ¶OMC: on medical criteria.