Quieting the neonatal intensive care unit: A quality improvement initiative

Table 1 Comparison of change in mean noise levels after each Plan-Do-Study-Act cycle

Noise level	Mean difference in 24-h mean noise	t-test statistic	P value
Baseline to PDSA 1	-17.3	6.7	< 0.01a
PDSA 1 to PDSA 2	-3.1	2.4	0.053
PDSA 2 to PDSA 31	4.4	-3.7	< 0.01a
Baseline to PDSA 2	-20.4	6.2	< 0.01a
Baseline to PDSA 3	-15.9	5.9	< 0.01a

^aP < 0.01.

¹Significant increase in noise.

PDSA: Plan-Do-Study-Act.