. 2020 Jan 24;43(7):zsz322. doi: 10.1093/sleep/zsz322

Table 2.

Characterization of PWA-drops features according to sleep stages.

PWA-drop features	Sleep stages
	N1	N2	N3	REM	p
Index, event/hour	58.8 ± 20.3	49.4 ± 21.6^a	36.9 ± 23.9^a,b	64.8 ± 23.9^a,b,c	<0.0001
Mean duration, second	15.7 ± 3.2	13.7 ± 2.7^a	12.8 ± 3.1^a,b	14.3 ± 3.2^a,b,c	<0.0001
Mean AUC, %min/hour	639 ± 165	508 ± 118^a	447 ± 120^a,b	550 ± 163^a,b,c	<0.0001
Mean duration-normalized index, event/hs	3.9 ± 1.5	3.8 ± 1.8^a	3.1 ± 2.1^a,b	4.8 ± 2.1^a,b,c	<0.0001
Mean AUC-normalized index, event/hour %seconds	0.10 ± 0.04	010 ± 0.05^a	0.09 ± 0.06^a,b	0.12 ± 0.05^a,b,c	<0.0001

Data are presented as mean ± SD. Data were evaluated by repeated measures ANOVA followed by Bonferroni’s post-hoc test as appropriate.

^aStatistically different from N1.

^bStatistically different from N2.

^cStatistically different from N3.