Table 2.
Sex-specific prevalence of NSSI among Chinese students.
| 6-month prevalence |
12-month prevalence |
Lifetime prevalence |
||||
|---|---|---|---|---|---|---|
| Range | IQRa | Range | IQRa | Range | IQRa | |
| Female | 8.4–32.4 | 18.7 (14.6–24.5) | 2.2–83.3 | 24.3 (14.1–35.7) | 0.5–50.7 | 26.5 (20.0–37.0) |
| Primary school | – | – | 23.6 | 23.6 | 26.3 | 26.3 |
| Middle school | 13.9–32.4 | 29.4 (21.6–30.9) | 5.9–53.0 | 29.6 (23.4–41.2) | 8.6–47.6 | 41.6 (39.1–46.6) |
| High school | 16.6–20.8 | 18.7 (17.7–19.8) | 6.7–37.6 | 25.2 (14.1–29.2) | 33.9 | 33.9 |
| College | 8.4–14.8 | 11.6 (10.0–13.2) | 2.2–24.0 | 10.0 (8.7–14.0) | 0.5–37.0 | 20.4 (16.5–27.4) |
| Male | 5.8–30.6 | 14.0 (9.4–22.5) | 1.4–83.5 | 24.0 (15.3–30.9) | 0.3–46.9 | 27.7 (19.0–36.9) |
| Primary school | – | – | 25.1 | 25.1 | 28.8 | 28.8 |
| Middle school | 6.3–30.6 | 24.9 (15.6–27.8) | 3.0–39.2 | 27.8 (17.8–33.2) | 11.3–46.9 | 38.4 (37.6–39.4) |
| High school | 10.4–15.3 | 12.9 (11.6–14.1) | 6.9–30.9 | 19.3 (10.0–23.7) | 30.2 | 30.2 |
| College | 5.8–12.7 | 9.2 (7.5–11.0) | 1.4–24.8 | 14.7 (10.8–16.8) | 0.3–42.7 | 24.5 (17.0–33.9) |
Subgroup analysis was conducted according to period prevalence measure, mainly include 6 m, 12 m, and lifetime.
a
Data are median (IQR); range unless otherwise specified.