Table 4.

The top 7 clusters of keywords for psychache in the suicidology during 1994–2020.

Cluster ID	Major keywords	Content and interpretation of the cluster	Size	Silhouette value	Mean (year)
#0	Depression, hopelessness, psychache, eventual suicide, perfectionism,	The model construction of suicide and psychache.	38	0.927	2006
#1	Anxiety, social support, substance abuse, self esteem, adjustment,	Positive mental change in suicidal population.	37	0.883	2014
#2	Validity, prevention, psychache scale, stress, symptom, suicide ideation	Psychometric test of psychache.	37	0.845	2013
#3	Association, attitude, death, loneliness, severity, bereavement, cognition?impact	Application study of psychache on bereaved.	35	0.924	2013
#4	Behavior, disorder, suicide attempt, children, maltreatment, abuse, adverse	Application study of psychache on children suicide population.	32	0.868	2010
#5	Risk factor, college student, comorbidity, suicidality, survivor, anxiety	Application study of psychache on college students and survivors.	27	0.91	2014
#6	Youth, post-traumatic stress disorder, gender difference, intimate partner violence	Application study of psychache on adolescent suicide population.	27	0.986	2011