Psychological characteristics of suicide attempters among undergraduate college students in China: a cross-sectional study

Table 2 Comparison between Suicide Attempters and Non-Suicide Attempters Based on Items in the Suicide Behavior Questionnaire-Revised (SBQ-R)

SBQ-R	Suicide Attempt		Total	Statistic	p-value	Cohen’s d
SBQ-R	Yes (n = 237)	No (n = 1185)	(n = 1422)	Statistic	p-value	Cohen’s d
Past-Year Ideation Frequency
Mean ± SD	1.81 ± 1.05	0.32 ± 0.68	0.57 ± 0.02	20.90	< 0.001^a	0.75
Median (min, max)	2 (0, 3)	0 (0, 3)	0 (0, 3)	240,548.00	< 0.001^b	1.04^c
Life-Time Threat (Inform Someone)
Mean ± SD	0.63 ± 0.48	0.11 ± 0.31	0.19 ± 0.40	16.11	< 0.001^a	0.34
Median (min, max)	1 (0, 1)	0 (0, 1)	0 (0, 1)	214,248.00	< 0.001^b	0.72^c
Likelihood of Future Attempt
Mean ± SD	0.50 ± 0.50	0.05 ± 0.21	0.12 ± 0.33	13.79	< 0.001^a	0.28
Median (min, max)	1 (0, 1)	0 (0, 1)	0 (0, 1)	204,531.00	< 0.001^b	0.62^c

1. Past-Year Ideation Frequency is derived from response to Q2; Life-Time Threat from Q3; and Likelihood of Future Attempt from Q4 of the SBQ-R. Q1 is omitted
2. ^aIndependent samples t-test; ^bMann-Whitney U test
3. ^ccalculation obtained from https://www.psychometrica.de/effect_size.html
Ref: Cohen (1992), .00 to .19 as trivial; values .20 to .49 as small effect, values .50 to .79 as medium effect, and values ≥ .80 as a large effect

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