Table 1. Univariate statistics of independent variables for the suicide and control groups.

	Suicide group		Control group
Variable
	MeanSD	Range	MeanSD	Range	p-value
		(min,max)		(min,max)
Age	27.410.3	(17, 97)	27.79.2	(14, 96)	0.000652
Community number	283.7284.3	(1, 1000)	46.379.4	(1, 1000)	0.0001
	82.998.7	(2, 1000)	65.867.6	(2, 1000)	0.0001
	0.0870.097	(0, 1)	0.1500.138	(0, 1)	0.0001
Homophily (suicide)	0.01100.0329	(0, 1.000)	0.00120.0080	(0, 0.667)	0.0001
Registration period	1235.7638.9	(122, 2878)	1333.5670.5	(102, 2891)	0.0001
Gender (female)	5,786 (57.9)		126,941 (55.4)		0.0001
No. suicidal communities	1.200.51	(1, 4)	N/A	N/A	N/A
No. login days	28.94.4	(1, 31)	26.96.3	(1, 31)	0.0001

The p-value for the gender is based on the Chi-square test. The p-values for the other independent variables are based on the Student’s t-test. Also shown are the statistics of two auxiliary variables that are not used in the logistic regression, i.e., the number of suicidal communities to which the user belongs and the number of days on which the user logged on to mixi. The p-value for the number of log-on days is based on the Student’s t-test. SD: standard deviation.