Table 1.
Group Differences on NSSI Characteristics, Protective Factors, and Suicidality as a function of Age of Onset
| NSSI Characteristics/Protective Factors | Young Age of Onset(n = 141)M (SD) | Typical Ageof Onset(n =374)M (SD) | Older Ageof Onset(n = 129)M (SD) | F-Statistic (df = 2) | d |
|---|---|---|---|---|---|
| Lifetime Frequencya | 1.80 (0.51) | 1.54 (0.56) | 0.96 (0.60) | 6.23** | 0.48 |
| Number of Methods | 3.69 (1.75) | 3.33 (1.59) | 2.08 (1.13) | 12.07** | 0.39 |
| Past Year Frequencya | 1.02 (0.52) | 0.82 (0.51) | 0.62 (0.48) | 18.02** | 0.29 |
| Life Satisfaction | 3.50 (1.25) | 3.71 (1.28) | 3.86 (1.18) | 0.02 | 0.00 |
| Subjective Happiness | 2.70 (0.75) | 2.80 (0.77) | 2.93 (0.79) | 0.21 | 0.06 |
| Resilience | 4.08 (1.07) | 4.27 (1.10) | 4.39 (1.02) | 2.35 | 0.18 |
| Categorical Variable | Younger % Yes | Typical % Yes | Older % Yes | Χ 2 | Cramer’s V |
|---|---|---|---|---|---|
| Medical Attention Needed | 18.7 | 16.1 | 8.6 | 6.50* | 0.10 |
| Perceived Recovery | 25.4 | 33.7 | 43.5 | 7.70* | 0.12 |
| Lifetime Ideation Only | 19.6 | 26.8 | 35.2 | 8.21* | 0.11 |
| Lifetime Suicide Plan | 38.4 | 40.9 | 35.9 | 1.06 | 0.04 |
| Lifetime Suicide Attempt | 39.9 | 24.7 | 10.9 | 29.60** | 0.22 |
| Past Year Suicide Attempt(s) | 24.1 | 13.0 | 10.9 | 11.69** | 0.14 |
Note.
a
Means for lifetime and past year frequency are the log-transformed means.
*
p < .05
**
p < .01