Table 1 A. Descriptive statistics for depressed and non-depressed adolescents. B. Descriptive statistics for depressed with suicidal ideation (SI+) and without suicidal ideation (SI−). C. Descriptive statistics for depressed with non-suicidal self-injury (NSSI+) and without non-suicidal self-injury (NSSI−).

From: Default mode and salience network alterations in suicidal and non-suicidal self-injurious thoughts and behaviors in adolescents with depression

Variable

MDD (n = 49)

CTL (n = 21)

Statistic (df)

p-value

Age (years)

16.26 ± 1.33 (13.67–18.39)

15.96 ± 1.06 (13.59–17.51)

t(68) = 0.915

0.363

Sex (M/F)

15 / 34

9 / 12

χ2(1) = 0.510

0.475

Race (% White)

49

43

χ2(1) = 0.044

0.835

Medication status (%)

47

0

χ2(1) = 12.630

0.0004***

CDRS-R t-scores (past 2 weeks)

67.7 ± 7.93 (51–86)

32.41 ± 4.14 (30–42)

U = 1320

<2 × 10−12****

SIQ-JR scores (past month)

24.55 ± 17 (3–76)

2.05 ± 3.25 (0–15)

U = 3894.5

2 × 10−16****

Session intervals (days)

11.02 ± 6.14 (1–29)

11.19 ± 5.89 (1–23)

t(68) = −0.1075

0.915

Motion (mm)

0.05 ± 0.02 (0.02–0.09)

0.06 ± 0.02 (0.03–0.11)

t(68) = −2.098

0.040*

Variable

SI+ (n = 28)

SI− (n = 21)

Statistic (df)

p-value

Age (years)

16.44 ± 1.29 (13.67–18.39)

16.03 ± 1.38 (13.95–18.23)

t(47) = 1.055

0.297

Sex (M/F)

7/21

8/13

χ2(1) = 0.450

0.502

Race (% White)

43

57

χ2(1) = 0.492

0.483

Medication Status (%)

50

43

χ2(1) = 0.043

0.836

CDRS-R t-scores (past two weeks)

68.15 ± 8.87 (51–86)

67.10 ± 6.65 (58–81.5)

U = 312

0.724

SIQ-JR scores

32.11 ± 17.03 (14–76)

14.48 ± 10.73 (3–47)

t(47) = 4.159

0.00013***

Session intervals (days)

11.5 ± 6.65 (1–29)

10.38 ± 5.48 (1–24)

t(47) = 0.628

0.533

Motion (mm)

0.04 ± 0.01 (0.02–0.08)

0.05 ± 0.02 (0.02 - 0.09)

t(47) = −1.970

0.055

History of suicide attempt (%)

57

0

χ2(1) = 15.314

9×10−5***

History of NSSI (%)

71

43

χ2(1) = 2.959

0.085

NSSI frequency (past month)

5.41 ± 17.97 (0–90) [1]

2.10 ± 4.69 (0–16)

U = 310

0.527

Variable

NSSI+ (n = 29)

NSSI− (n = 20)

Statistic (df)

p-value

Age (years)

16.34 ± 1.37 (13.67–18.39)

16.15 ± 1.29 (13.95–18.23)

t(47) = 0.472

0.639

Sex (M/F)

9/20

6/14

χ2(1) = 0

1

Race (% White)

52

45

χ2(1) = 0.030

0.863

Medication Status (%)

48

45

χ2(1) = 0

1

CDRS-R t-scores (past two weeks)

68.13 ± 7.96 (58–85)

67.08 ± 8.05 (51–86)

U = 317

0.618

SIQ-JR scores

25.79 ± 16.81 (3–76)

22.75 ± 17.53 (4–74)

t(47) = 0.612

0.544

Session intervals (days)

10.55 ± 6.03 (2–29)

11.7 ± 6.39 (1–24)

t(47) = 0.640

0.526

Motion (mm)

0.05 ± 0.02 (0.03–0.09)

0.05 ± 0.02 (0.02–0.09)

t(47) = 0.249

0.805

History of suicidal ideation (%)

69

40

χ2(1) = 2.959

0.085

History of suicide attempt (%)

38

25

χ2(1) = 0.408

0.523

NSSI frequency (past month)

6.79 ± 17.67 (0–90) [1]

0 ± 0 (0–0)

U = 450

3 × 10−5***

  1. Continuous variables are reported as mean ± SD (min–max). Numbers in [] indicate number of missing participants. See Tables 1B and 1 C for descriptive statistics for SI+ versus SI− and NSSI + versus NSSI−, respectively.
  2. CDRS-R Children’s Depressive Rating Scale-Revised, MDD Major Depressive Disorder or Dysthymia, SIQ-JR Suicidal Ideation Questionnaire-Junior.
  3. *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001.
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