Table 1:

Weighted characteristics of the respondents, by age

Characteristic	Age, yr, % ± SE*
	12–13	14–15	16–17
No. of participants, unweighted	8766	7802	5496
Female	49.8 ± 0.4	49.7 ± 0.4	51.0 ± 0.4
Male	50.2 ± 0.4	50.3 ± 0.4	49.0 ± 0.4
Current survey cycle
Socioeconomic status
Below low-income cut-off	13.4 ± 0.6	12.0 ± 0.7	11.0 ± 0.7
At or above low-income cut-off	86.6 ± 0.6	88.0 ± 0.7	89.0 ± 0.7
Suicide by a schoolmate
In past yr	3.6 ± 0.3	9.4 ± 0.6	9.3 ± 0.6
> 1 yr ago	3.6 ± 0.3	9.7 ± 0.5	14.8 ± 0.8
No suicides	51.0 ± 0.8	30.6 ± 0.8	36.4 ± 1.0
Don’t know	41.8 ± 0.8	50.3 ± 0.9	39.5 ± 1.0
Suicide by someone they knew personally
In past yr	3.7 ± 0.3	5.6 ± 0.4	6.9 ± 0.5
> 1 yr ago	6.0 ± 0.4	8.2 ± 0.5	13.2 ± 0.7
No suicides	79.3 ± 0.7	75.8 ± 0.7	72.9 ± 1.0
Don’t know	11.0 ± 0.5	10.4 ± 0.5	7.0 ± 0.5
Suicide ideation
Yes	5.8 ± 0.4	9.7 ± 0.5	9.8 ± 0.6
No	94.2 ± 0.4	90.3 ± 0.5	90.2 ± 0.6
Suicide attempt
Yes	2.9 ± 0.3	4.7 ± 0.3	4.5 ± 0.4
No	97.1 ± 0.3	95.3 ± 0.3	95.5 ± 0.4
Previous survey cycle
Stressful life event†
≥ 1 event	34.8 ± 0.8	35.8 ± 0.9	32.8 ± 1.0
0 events	65.2 ± 0.8	64.2 ± 0.9	67.2 ± 1.0
Drinking to intoxication,‡
≥ 1 time/mo	NA	0.6 ± 0.2	9.1 ± 0.7
< 1 time/mo	NA	99.4 ± 0.2	90.9 ± 0.7
Drug use†
Yes	NA	5.2 ± 0.4	22.5 ± 0.9
No	NA	94.8 ± 0.4	77.5 ± 0.9
Suicide attempt‡§
Yes	NA	2.9 ± 0.3	4.7 ± 0.4
No	NA	97.1 ± 0.3	95.3 ± 0.4

Note: NA = not applicable, SE = standard error.

^*Unless otherwise indicated.

^†Stressful life events reported in the previous survey cycle 2 yr earlier (e.g., ages 10–11 yr for those aged 12–13 yr at baseline).

^‡Reported at previous assessment 2 yr earlier (e.g., ages 12–13 yr for those aged 14–15 yr at baseline). These measures were not assessed prior to age 12; thus, no data are available for those aged 12–13 yr at baseline.

^§Previous suicide attempts were only assessed in the subset of respondents with baseline information from cycles 4–7 (not 3–7) because of availability of the assessment.