Table A2.

Descriptive statistics: Psychiatric disorders

Psychiatric disorder	n	%	κ	agreement
Depression	243	48.6	0.77	substantial
Anxiety; panic attacks	200	40	0.77	substantial
Trauma; PTSD	26	5.2	0.57	moderate
Eating disorder	17	3.4
Borderline Personality Disorder	16	3.2	0.86	almost perfect
Obsessive-Compulsive Disorder	15	3	0.86	almost perfect
Schizophrenia; other psychotic disorder	14	2.8
Bipolar disorder	10	2	0.62	substantial
Substance Use Disorder	9	1.8
Autism Spectrum Disorder	5	1
Picking disorder	5	1
Suicidality	320	64	0.72	substantial

Psychiatric disorders in descending order of the number of r/selfharm users (n = 500) disclosing a diagnosis of or concern with that disorder. κ = Fleiss’s kappa statistic, an indicator of intercoder reliability. Interpretation of κ (from Landis & Koch, 1977) is also reported. All values of κ were significantly better than chance agreement at the P < 0.001 level. Items with associated κ’s are from an a priori codebook, while no κ’s are reported for additional disorders or concerns added to the codebook post hoc. These additional items were disclosed by at least 1% of users (n = 5), after resolving disagreements between coders.