Table 2.

Factors associated with suicide/self-harm related Internet use (n=3,946).

	Total sample N=3,946	No suicide/self-harm related Internet use n=3,060	Suicide/self-harm related Internet use n=886	OR [95% CI]	P value⁎
Gender, % female	61.1% (2,410/3,946)	59.9% (1,833/3,060)	65.1% (577/886)	1.24 [1.07 to 1.46]	0.005
Ethnicity, % non white	4.0% (150/3787)	3.8% (110/2,933)	4.7% (40/854)	1.26 [0.87 to 1.83]	0.219
Social class
Professional/managerial	64.9% (2,398/3,695)	64.7% (1,859/2,872)	65.5% (539/823)	0.97 [0.82 to 1.14]	0.686
other	35.1% (1,297/3,695)	35.3% (1,013/2,872)	34.5% (284/823)
Suicidal thoughts, age 21 years	19.5% (765/3,925)	12.2% (371/3,043)	44.7% (394/882)	5.81 [4.90 to 6.90]	<0.001
Suicidal plans, age 21 years	4.6% (180/3,924)	1.5% (46/3,044)	15.2% (134/880)	11.7 [8.30 to 16.5]	<0.001
Self-harm, age 21 years	20.8% (819/3,946)	13.1% (400/3,060)	47.3% (419/886)	5.97 [5.04 to 7.07]	<0.001
Sought professional help for self-harm or suicidal thoughts, age 21 years	5.6% (221/3,946)	2.2% (67/3,060)	17.4% (154/886)	9.40 [6.98 to 12.7]	<0.001
Self-harm exposure (family/friend), age 16 years	44.1% (1,328/3,010)	40.3% (938/2,327)	57.1% (390/683)	1.97 [1.66 to 2.34]	<0.001
Depression, age 18 years	7.3% (186/2,561)	5.2% (104/1,987)	14.3% (82/574)	3.01 [2.22 to 4.10]	<0.001
Anxiety, age 18 years	11.1% (284/2,561)	8.7% (172/1,987)	19.5% (112/574)	2.56 [1.97 to 3.31]	<0.001
Number of close friends, age 21 years
3+ friends	96.8% (3,674/3,795)	97.4% (2,860/2,936)	94.8% (814/859)	2.08 [1.43 to 3.03]	<0.001
0-2 friends	3.2% (121/3,795)	2.6% (76/2,936)	5.2% (45/859)
Not in employment, education, or training (NEET) age 21 years	8.2% (311/3,785)	7.9% (232/2,928)	9.2% (79/857)	1.17 [0.90 to 1.54]	0.225

Number of participants with no suicide/self-harm related internet use 3,060; number of participants with suicide/self-harm related Internet use 886

^⁎Difference between those with and without suicide/self-harm related internet use