Study	Screened	Entered	Completed	% Screened	% Entered	Mean hours used (control group)
Bakker 2010	751	80	76	10.1	95	5.2
Ballard 2007	204	104	104	51	100	2.9
Berry 2014	240	156	131	54.5	84	4
Blau 2012	Not reported	35	32	N/A	91	5.6
Bloch 2018	952	208	172	18	82	5.5
Bogan 2017	Not reported	70	65	N/A	N/A	4.81
Castronovo 2006	Not reported	50	40	N/A	80	Not reported
Chang 2015	Not reported	25	19	N/A	76	5.8
d'Ortho 2000	Not reported	25	25	N/A	100	4.7
Damjanovic 2009	Not reported	100	78	N/A	78	5.1
Dolan 2008	222	184	142	64	76	5.3
Ficker 2003	Not reported	100	95	N/A	95	4.8
Fietze 2007	Not reported	21	21	N/A	100	4.2
Galetke 2008	Not reported	20	20	NA	100	6.4
Gay 2003	Not reported	40	27	N/A	67.5	5.6
Gfüllner 2007	Not reported	Not reported	18	N/A	N/A	5.3
Gonzalez‐Moro 2005	Not reported	20	Not reported	N/A	N/A	Not reported
Gulati 2015	75	31	28	37.3	90.3	2.2
Heiser 2010	Not reported	75	49	N/A	65.3	4.3
Hudgel 2000	Not reported	53	39	N/A	73.6	5.5
Hukins 2004	58	55	46	79	84	4.86
Hussain 2004	Not reported	10 (assumed)	10	N/A	100	3.7
Jarvis 2006	Not reported	Not reported	20	N/A	N/A	6.8
Kendrick 2002	Not reported	41	27	N/A	65.85	Not reported
Konermann 1998	Not reported	50	48	N/A	96	5.6
Kushida 2011	178	168	140	78.7	83.3	4.6
Leidag 2008	Not reported	30	18	N/A	60	5.8
Loube 2004	Not reported	Not reported	Not reported	N/A	N/A	Not reported
Marrone 2004	Not reported	22 (assumed)	22	N/A	100	4.4
Marshall 2008	Not reported	Not reported	19	N/A	NA	3
Masa 2015	351	221 (numbers reported here reflect participants screened for three treatment arms)	200	57%	90%	5.3
Massie 2003	Not reported	46	44	N/A	95.6	4.5
Meurice 1996	Not reported	16	16	N/A	100	5.7
Meurice 2007	Not reported	83	65	N/A	78	6.5
Meurice 2009	Not reported	20	20	N/A	100	5.3
Modrak 2007	Not reported	Not reported	26	N/A	N/A	5.1
Muir 1998	Not reported	Not reported	16	N/A	N/A	4.9
Neill 2003	Not reported	42	37	N/A	88	5.3
Nilius 2006	Not reported	52	51	N/A	98	5.2
Nolan 2007	Not reported	34	29	N/A	85	4.9
Noseda 2004	93	27	24	26	89	5.3 (average usage on 'effective nights')
Nussbaumer 2006	Not reported	34	30	N/A	88	4.8
Patruno 2007	Not reported	40	31	N/A	78	6.1
Pépin 2009	Not reported	20	20	N/A	100	5.3
Pépin 2016	569	322	281	49.4	87.3	5.2
Powell 2012	51	48	47	92.2	97.9	4.4
Randerath 2001	Not reported	52	47	N/A	90	5.3
Reeves‐Hoché 1995	Not reported	83	62	N/A	75	5
Resta 2004	Not reported	20	20	N/A	100	5.3
Rochford 2006	Not reported	N/A	13	N/A	N/A	4.6
Rohling 2011	Not reported	39	33	N/A	84.6	6.6
Rostig 2003	Not reported	30	30 (assumed)	N/A	100 (assumed)	3.8
Ruhle 2011	Not reported	44	44	N/A	100	4.5
Ryan 2009	125	125	112	91	91	5.21
Senn 2003	Not reported	31	29	N/A	93.55	7.1
Sériès 1997	39	36	36	92.3	100	Not reported
Sériès 2001	Not reported	48	48 (assumed)	N/A	100 (assumed)	4.2
Soudorn 2016	104	20	20	19.2	19.2	5.2
Teschler 2000	Not reported	10	10	N/A	100	6.1
To 2008	Not reported	43	41	N/A	95	3.8
Vennelle 2010	368	200	181	49.1	90.5	4
Wenzel 2007	Not reported	20 (assumed)	20	NA	100 (assumed)	5.8
West 2006	633	98	86	16	88	5.6
Worsnop 2010	Not reported	54	54 (assumed)	N/A	100 (assumed)	4.5
Abbreviations: N/A: not applicable