Table 3.

Results of the Cross-Sectional Exponential Random Graph Models of friendship at Time 1 by Activity Type

	Model 3
		95% Confidence Interval
Effect	Estimate (standard error)	Lower bound	Upper bound	Odds ratio
Friendship probability	−6.12 (0.17)	−6.45	−5.79	0.002
Friendship skew	−1.56 (0.04)	−1.65	−1.48	0.21
Homophily
Gender	0.78 (0.02)	0.74	0.82	2.18
Race	0.60 (0.05)	0.50	0.69	1.82
Grade	2.37 (0.16)	2.06	2.67	10.70
SES	0.17 (0.01)	0.14	0.19	1.19
GPA	0.57 (0.03)	0.51	0.66	1.77
Problem behavior	0.78 (0.06)	0.66	0.90	2.18
Physical health	0.32 (0.04)	0.24	0.40	1.38
Depression	0.12 (0.03)	0.04	0.16	1.13
Network structure
Open triads	−0.35 (0.01)	−0.37	−0.32	0.70
Closed triads	1.22 (0.03)	1.17	1.27	3.39
Activity type
Sports	0.56 (0.02)	0.52	0.61	1.75
Arts	0.85 (0.04)	0.77	0.94	2.34
Academics	0.66 (0.07)	0.52	0.80	1.93

Note. All effects are significant at p < .001.