TABLE 2.

Rates of NSSI Engagement and Behavioral Methods by Gender and Grade

	n	Rates		Behavioral Method in Lifetime
		Lifetime		Cut/carve Skin		Burn Skin		Insert Objects		Pick Skin		Hit Self		Tattoo Self		Other
		n	%	n	% of	n	% of	n	% of	n	% of	n	% of	n	% of	n	% of
Overall	665	53	8.0	24	45.3	7	13.2	8	15.1	4	7.5	25	47.2	1	2.0	10	18.9
Girls	366	33	9.0	21	63.6	6	18.2	5	15.2	3	9.1	14	42.4	1	3.0	5	15.2
Third grade	103	7	6.8
Sixth grade	141	3	2.1
Ninth grade	122	23	18.9
Boys	299	20	6.7	3	15.0	1	5.0	3	15.0	1	5.0	11	55.0	0	0.0	5	25.0
Third grade	94	8	8.5
Sixth grade	106	7	6.6
Ninth grade	99	5	5.1
Third grade	197	15	7.6	2	13.3	1	6.7	1	6.7	1	6.7	9	60.0	0	0.0	5	33.3
Sixth grade	247	10	4.0	3	30.0	1	10.0	1	10.0	0	0.0	5	50.0	0	0.0	1	10.0
Ninth grade	221	28	12.7	19	70.4	5	18.5	6	22.2	3	11.1	11	40.7	1	3.8	4	15.4

The sum of subgroup numbers may not be equal to the total n for data on behavioral methods because many youth reported multiple methods.