Table 9.

Studies with measurement of snoring

Reference	N	Snoring measure		Explanation of snoring measurement	Percent change
		Base	Appl
[34]	68	8.5	1.5	Visual analogue scale 0–10	−82
[42]	51	9.4	8.2	Number of snores/min	−13
[57]	15	193	20	Number of snores/h	−90
[59]	41	0.7	0.5	Number of snores/h	−29
[68]	24	50	33	Number of snores/h	−34
[21]	10	11	3	Percent of sleep time spent in loud snoring	−73
[73]	22	59	24	Number of snores/h	−59
[75]	25	3.4	1.8	Nights/per week with disturbing snoring	−47
[72]	28	402	242	Number of snores/h	−40
[82]	73	366	207	Number of snores/h	−43
[86]	16	3.1	2.6	Nights/per week with disturbing snoring	−16
[79]	32	0.7	0.5	Minutes of snoring/h of sleep	−29
[84]	20	55	36	Snoring epochs/h of sleep	−35
[89]	40	0.86	0.57	Minutes of snoring/h of sleep	−34
[96]	11	240	75	Noise level	−69
[97]	20	9.0	6.8	Visual analogue scale 0–10	−24
[99]	17	53	16	Total snoring time	−66
[100]	16	144	64	Number of snores/h of sleep	−56
Summary
	529				−45