Table 4.

Spindle density during stage N2 sleep before and after 6 months of CPAP treatment

	Baseline	CPAP	Difference	P
Overall spindle density (events/min)	1.65 (0.88)	1.84 (0.97)	0.19 (0.07 to 0.32)	.003
Fast spindle density (events/min)	1.09 (0.73)	1.18 (0.83)	0.62 (0.40 to 0.84)	<.0001
Slow spindle density (events/min)	0.56 (0.54)	0.66 (0.54)	−0.43 (−0.60 to −0.25)	<.0001

N = 90. Data are mean (standard deviation) and mean difference (95% CI). P values are calculated using paired t tests. Bold values indicate p < 0.05. Bold values indicate p < 0.05.