Table 2. Characteristics of Included Studies of Adults listed by Measurement Type.

Citation	Country	Design	Age	N	Response Rate %	Prevalence Outcomes		Results %
Self-reported behaviour
Bixler et al [77]	USA	Cross-sectional	18–80	1006	ns	Lifetime	Yes/no	2.5
						Current		0.4
Bjorvatn et al [78]	Norway	Cross-sectional	18–96	1000	25.38	Lifetime	At least once during past 3 months from 6-point scale (never, less than once per month, less than once per week, 1–2 days per week, 3–5 days per week, daily/almost daily)	22.40
						3 month		1.70
Davis [79]	England	Cross-sectional	ns	100	ns	Lifetime	Yes/no	3.0
Hirotsu et al [80]	Brazil	Cross-sectional	16–60+	2017	99.95	Current	Yes/no	1.00
Mume [11]	Nigeria	Cross-sectional	18–60	228	91.20	Lifetime	Yes/no	7.00
Orme [81]	UK	Cross-sectional	ns	151	ns	Lifetime	Yes/no	13.91
Panda et al.[82]	India	Cross-sectional	16–55	1050	>95	1 month	ns	.60
Stepansky et al [83]	Austria	Cross-sectional	ns	1000	ns	ns	ns	.004
Thomas & Pederson [84]	USA	Cross-sectional	19–34+	1116	88.35	Current	ns	2.24
Vela-Bueno et al [85]	Spain	Cross-sectional	18–65+	1131	75.40	Lifetime	Yes/no	1.10
Zeitlhofer et al (2010)	Austria	Cross-sectional	14 = 50+	1000	82.10	Current	ns	2.00
Diagnosis
Frauscher et al [86]	Austria	Cross-sectional	19–77	100	27.50	Lifetime	non-bothersome sleepwalking < 2 times per week ICSD-2	12
Oluwole [87]	Nigeria	Cross-sectional	19–35	276	30.84	Lifetime	Yes/no ICSD	4.35
						2 weeks		1.45
Ohayon [88]	UK	Cross-sectional	15–100	4972	79.60	Current	DSM-IV	2.00
Ohayon et al [89]	USA	Cross-sectional	18–102	15 929	83.2	12 months	DSM-IV	3.6
						Childhood		25.7