Table 3.

Mean differences between NSSI and no NSSI groups on study measures at Time 1.

Variable	Total M(SD)	NSSI M(SD)	No NSSI M(SD)	t-statistic	p
Age	17.96 (0.69)	17.95 (0.73)	17.96 (0.68)	t(1053) = 0.334	p = 0.14
Gender	0.72 (0.45)	0.77 (0.42)	0.70 (0.46)	t(495.96) = −2.283	p = 0.23
Stress	1.97 (0.43)	2.15 (0.43)	1.91 (0.40)	t(1110) = −8.525	p < 0.001
Emotional reactivity	1.60 (0.89)	2.00 (0.90)	1.46 (0.84)	t(1114) = −9.080	p < 0.001
Self-disgust	3.08 (1.24)	3.69 (1.30)	2.86 (1.14)	t(428.17) = −9.525	p < 0.001
Friends	0.24 (0.43)	0.38 (0.49)	0.20 (0.40)	t(409.80) = −5.478	p < 0.001
Fear of pain	26.4 (6.73)	26.57 (6.68)	26.34 (6.75)	t(476.415) = −0.487	p = 0.63