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Table 1 Sample characteristics for eligible publications (listed by year of publication)

From: A systematic review of the frequency and severity of manic symptoms reported in studies that compare phenomenology across children, adolescents and adults with bipolar disorders

Publication Country Sample size (n) Gender (% males)b Age groups (age range in years and number of participants per group)a Setting BD subtypes
Child Adolescent Adult
Ballenger et al. (1982) USA 21 NK   <21
(n = 9)
>30
(n = 12)
Inpatient BD-I (mania)
McElroy et al. (1997) USA 128 43%   12–18
(n = 40)
19–45
(n = 88)
Inpatient BD-I (mania)
Findling et al. (2001) USA 90 71% 5–11
(n = 56)
12–17
(n = 34)
  Outpatient BD-I
Jerrell and Shugart (2004) USA 267 52% 7–17
(n = 83)
18–59
(n = 184)
Inpatient and outpatient BD-I
Lazaro et al. (2007) Spain 43 40% < 13
(n = 14)
≥13
(n = 29)
  Outpatient BD-I, BD-II and BD-NOS
Birmaher et al. (2009)c USA 263 53% 4–11
(n = 173)
<12
(n = 90)
  Inpatient and outpatient BD-I, BD-II and BD-NOS
Song et al. (2010) Korea 53 59% NK
(n = 16)
NK
(n = 37)
  Inpatient BD-I, BD-II and BD-NOS
Chan et al. (2011) UK 35 51% 7–12
(n = 9)
13–18
(n = 26)
  Outpatient BD-I, BD-II and BD-NOS
Safer et al. (2012) USA 1106 NK 10–17
(n = 457)
18–65
(n = 649)
Inpatient and outpatient BD-I (mania)
  1. NK not known
  2. aAge Groups: child refers to prepubertal children or those aged ≤12; adolescent refers to age ≥13 to 18 years, although one study extended the age range up to 21 years; –adult refers to individuals aged ≥18 years, although one study chose a minimum of age ≥30 years
  3. bPercentages are reported to the nearest integer
  4. cThe study reported three age groups, but only two met eligibility criteria for inclusion in this review