Table 2

Characteristics of case–control reports

Author	Country	Year of data collection	Sample based	Participant selection		Sample size		Age		% men
Author	Country	Year of data collection	Sample based	Case	Control	Case	Control	Case	Control	Case	Control
Anesi et al66	USA	2012	Hospital-based	Consecutive patients	Random	151	151	58.67±17.96	46.33±28.44	28.48	12.58
Apisarnthanarak et al78	Thailand	2004	Hospital-based	Random	Random	46	46	58.25±16.51	56.5±14.47	28.26	28.26
Aswani et al39	India	2011	Hospital-based	NI	NI	181	124	60.2±13.76	53.47±18.56	45.86	41.94
Borer et al42	Israel	2007	Hospital-based	Consecutive patients	Not clear	42	464	60.7±55.30	62.8±55	NI	NI
Briongos-Figuero et al55	Spain	2010	Hospital-based	NI	Random	97	103	78±14	77±13	45.40	31.10
Chitnis et al71	USA	2010	Hospital-based	Consecutive patients	Not clear	34	34	68.67±34.80	69.67±42.56	38.00	65.00
Colodner et al41	Israel	2005	Hospital-based	Consecutive patients	Consecutive patients	150	150	63.75±14.20	56±14	24.70	10.70
Colodner et al43	Israel	NI	Hospital-based	Consecutive patients	Consecutive patients	128	183	61.5±22.90	46.4±24.90	35.90	13.70
Dan et al72	USA	2012	Hospital-based	Consecutive patients	Consecutive patients	143	681	67.7±14.23	65.3±18.60	59.00	44.00
Ashley et al73	USA	1997	Hospital-based	Consecutive patients	Consecutive patients	64	79	67.30	61.80	45.30	69.60
García-Tello et al57	Spain	2012	Hospital-based	Consecutive patients	Consecutive patients	416	1108	72.60±20.50	54.70±29.80	36.10	21.50
Hayakawa et al67	USA	2009	Hospital-based	NI	NI	532	532	66.00±16.50	62.40±18.10	45.30	48.70
Hershow et al68	USA	1990	Hospital-based	NI	NI	15	10	54.00	44.00	53.00	30.00
Hershow et al68	USA	1990	Hospital-based	NI	NI	56	14	50.00	57.00	48.21	35.71
Hsu et al69	USA	2001	Hospital-based	NI	NI	91	86	73.8±15.20	68±17.40	43.00	49.00
Isendahl et al58	Sweden	2009	Hospital-based	Consecutive patients	Random	945	9390	65.62±15.7		58.90
Jinnah et al23	Bangladesh	NI	Hospital-based	Random selection	Random selection	150	150	NI	NI	NI	NI
Khurram et al50	Pakistan	1998	Hospital-based	Consecutive patients	Consecutive patients	37	20	52.8±15.10	34.9±21.20	54.10	65.00
Kim et al46	Korea	2008	Hospital-based	Consecutive patients	Consecutive patients	82	122	66.3±10.50	67.3±15.70	59.80	68.90
Manzur et al56	Spain	1997	Hospital-based	Consecutive patients	Consecutive patients	50	98	69.06±13.90	58.33±18.24	45.00	65.30
Park et al45	Korea	2007–2013	Hospital-based	Consecutive patients	Random	75	225	NI	NI	12.00	6.20
Ren et al32	China	2015	Hospital-based	Consecutive patients	Not clear	98	49	NI	NI	NI	NI
Saade et al70	USA	2000–2013	Hospital-based	NI	NI	428	59 041	62.95±12.10	66.75±5.76	100	100
Saibal et al24	Bangladesh	2009	Hospital-based	Convenient and purposive	Convenient and purposive	47	43	56.3±12.20	35.7±10.50	68.10	72.10
Silva et al27	Brazil	2002	Hospital-based	Consecutive patients	Consecutive patients	56	51	65.80	61.50
Søraas et al49	Norway	2010	Hospital-based	Consecutive patients	Random	100	190	55.00±19.00	64.00±17.00	12.00	12.00
Vinken et al15	The Netherlands	2014	Hospital-based	Consecutive patients	NI	283	283	73.30±12.10	72.20±13.10	0.00	0.00
Wright et al74	USA	1996	Hospital-based	Consecutive patients	Consecutive patients	118	317	NI	NI	30.50	15.10
Wright et al75	USA	1996	Hospital-based	Consecutive patients	Consecutive patients	67	381	NI	NI	17.90	16.00

For an expanded version of this table (ie, containing more details about the study population in each original report and bye case and control groups) refer to online supplemental tables 4 and 7.
NI, no information available.