TABLE 3—
Binary Logistic Regression of Variables Associated With Nonsuicidal Self-Injury: Pooled Sample and Gender Differences: Youth Risk Behavior Surveillance System, United States, 2015
| Independent Variable | Both Genders, No. or OR (95% CI) | Female, No. or OR (95% CI) | Male, No. or OR (95% CI) |
| Model 1 (all states)a | 50 493 | 26 147 | 24 346 |
| Sad 2 wk (past year) | 5.22 (4.58, 5.94) | 4.87 (4.27, 5.54) | 4.49 (3.60, 5.61) |
| Suicide attempt (past year) | 8.95 (7.27, 11.02) | 8.80 (6.54, 11.85) | 9.12 (6.57, 12.65) |
| Sexually active (past 3 mos) | 0.83 (0.71, 0.97) | 0.78 (0.66, 0.93) | 0.95 (0.75, 1.20) |
| Forced to have sex (ever) | 1.56 (1.24, 1.97) | 1.36 (1.06, 1.75) | 1.61 (0.92, 2.82) |
| Electronically bullied (past year) | 2.47 (2.08, 2.92) | 2.21 (1.83, 2.68) | 2.46 (1.75, 3.44) |
| Drank alcohol (past month) | 1.18 (1.01, 1.37) | 1.14 (0.95, 1.36) | 1.18 (0.92, 1.53) |
| Smoked cigarettes (past month) | 1.56 (1.25, 1.95) | 1.57 (1.17, 2.10) | 1.82 (1.31, 2.53) |
| Used marijuana (past month) | 1.06 (0.90, 1.25) | 1.27 (0.99, 1.63) | 0.84 (0.65, 1.07) |
| Hard drug use (ever) | 1.62 (1.27, 2.07) | 1.93 (1.43, 2.59) | 1.51 (1.01, 2.28) |
| Model 2 (all variables)b | 12 446 | 6 716 | 5 730 |
| Sad 2 wk (past year) | 3.30 (2.76, 3.95) | 3.27 (2.69, 3.98) | 2.60 (1.84, 3.68) |
| Suicidal thoughts (past year) | 2.91 (2.26, 3.76) | 3.40 (2.57, 4.50) | 2.50 (1.62, 3.86) |
| Made suicide plan (past year) | 1.78 (1.36, 2.34) | 1.70 (1.29, 2.26) | 1.91 (1.09, 3.34) |
| Suicide attempt (past year) | 3.36 (2.33, 4.86) | 2.73 (1.68, 4.44) | 4.42 (2.44, 8.00) |
| Suicide attempt requiring care (past year) | 0.92 (0.51, 1.68) | 1.03 (0.47, 2.23) | 0.68 (0.28, 1.66) |
| Sexually active (past 3 mos) | 0.83 (0.67, 1.02) | 0.79 (0.62, 1.01) | 0.88 (0.64, 1.21) |
| Forced to have sex (ever) | 1.30 (0.96, 1.77) | 1.19 (0.85, 1.66) | 1.20 (0.57, 2.55) |
| Electronically bullied (past year) | 2.17 (1.75, 2.70) | 2.00 (1.56, 2.57) | 1.87 (1.26, 2.78) |
| In a fight (past year) | 1.06 (0.84, 1.34) | 1.17 (0.88, 1.57) | 1.39 (1.01, 1.90) |
| Trying to change weight | 1.17 (1.00, 1.36) | 1.16 (0.96, 1.41) | 1.05 (0.83, 1.32) |
| Gay, lesbian, bisexual, or unsure | 2.64 (2.17, 3.21) | 2.12 (1.68, 2.67) | 3.39 (2.30, 5.00) |
| Drank alcohol (past month) | 1.14 (0.95, 1.36) | 1.08 (0.87, 1.34) | 1.17 (0.87, 1.56) |
| Smoked cigarettes (past month) | 1.38 (1.04, 1.83) | 1.42 (1.00, 2.01) | 1.51 (0.96, 2.39) |
| Used marijuana (past month) | 1.03 (0.82, 1.29) | 1.24 (0.90, 1.71) | 0.75 (0.52, 1.09) |
| Hard drug use (ever) | 1.61 (1.14, 2.26) | 1.82 (1.17, 2.83) | 1.61 (0.86, 3.01) |
Note. CI = confidence interval; OR = odds ratio. Frequencies reported are unweighted counts; ORs and CIs computed with weighted data.
a
Model 1 fit: Full sample: −2 log L = 988012.89; Wald = 284.02; P < .001. Female: −2 log L = 612511.52; Wald = 200.75; P < .001. Male: −2 log L = 360110.05; Wald = 55.56; P < .001.
b
Model 2 fit: Full sample: −2 log L = 691984.70; Wald = 127.33; P < .001. Female: −2 log L = 430077.50; Wald = 65.59; P < .001. Male: −2 log L = 250278.67; Wald = 26.76; P < .001.