Table 1 Demographic and clinical characteristics of the overall sample and by group

From: Cortical inhibitory markers of lifetime suicidal behavior in depressed adolescents

Participant characteristic

Overall sample (n = 74)

Healthy Control (n = 20)

Depresseda (n = 37)

Depressed+SBb (n = 17)

p-value (pFDR)

Demographic

 Age in years, M ± SD

15.33 ± 1.89

14.20 ± 1.76

15.70 ± 1.88

15.88 ± 1.57

0.005 (0.015)

 Sex, % (n)

    

0.319 (0.362)

  Female

59.46% (44)

45.00% (9)

64.86% (24)

64.71% (11)

 

  Male

40.54% (30)

55.00% (11)

35.14% (13)

35.29% (6)

 

 Right-handed, % (n)

93.24% (69)

90.00% (18)

100% (37)

82.35% (14)

0.023 (0.051)

 Race/ethnicity, % (n)

    

0.001 (0.004)

  African-American

16.22% (12)

45.00% (9)

5.41% (2)

5.88% (1)

 

  Asian-American

2.70% (2)

0.00% (0)

5.41% (2)

0.00% (0)

 

  Caucasian, Non-Hispanic

67.56% (50)

40.00% (8)

78.37% (29)

76.47% (13)

 

  Hispanic/Latino

2.70% (2)

5.00% (1)

2.70% (1)

0.00% (0)

 

  Native American

1.35% (1)

0.00% (0)

2.70% (1)

0.00% (0)

 

  Multiethnic/other

9.46% (7)

10.00% (2)

5.41% (2)

17.65% (3)

 

Clinical

 CDRS-R total score, M ± SD

36.59 ± 15.78

19.65 ± 1.69

41.48 ± 13.03

45.88 ± 15.64

0.285 (0.362)

 Length of illness (years), M ± SD

2.27 ± 1.96

N/A

2.08 ± 1.93

2.67 ± 2.05

0.313 (0.362)

 Currently prescribed psychotropic   medications, % (n)

43.24% (32)

0.00% (0)

54.05% (20)

70.59% (12)

0.372 (0.372)

 Familial psychiatric history, % (n)

69.86% (51)

0.00% (0)

94.44% (34)c

100% (17)

0.322 (0.362)

 Maximal lifetime history of suicidal   behavior, % (n)

    

0.0001 (0.001)

  None

66.22% (49)

100% (20)

78.38% (29)

0.00% (0)

 

  Non-suicidal self-injury

10.81% (8)

0.00% (0)

21.62% (8)

0.00% (0)

 

  Planning/preparation for a suicide   attempt

2.70% (2)

0.00% (0)

0.00% (0)

11.76% (2)

 

  Interrupted or aborted attempt

6.76% (5)

0.00% (0)

0.00% (0)

29.41% (5)

 

  Suicide attempt

13.51% (10)

0.00% (0)

0.00% (0)

58.82% (10)

 
  1. Note: The means (M) presented in this table are the sample means; SD = standard deviation; N/A = not applicable. To identify differences among the characteristics of the groups, one-way ANOVA (for continuous variables) and Fisher’s exact test (for categorical variables) were used. We tested for differences among the three groups on the demographic characteristics and for differences between the two depressed groups on the clinical characteristics. Correction for multiple comparisons was performed using the False Discovery Rate (FDR) method described by Benjamini and Hochberg [32].
  2. aDepressive disorder without lifetime history of suicidal behavior (SB)
  3. bDepressive disorder with lifetime history of SB
  4. c1 missing observation
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