Table 3.
Logistic regression of the effect of sleep duration on NSSI
| Variables | NSSI | |
|---|---|---|
| Crude OR (95%CI) |
Adjusted OR (95%CI) |
|
| Daily sleep duration(h) | ||
| 8–9(ref) | 1.00 | 1.00 |
| < 6 | 1.78(1.51,2.11) ** | 1.42(1.18,1.71) ** |
| 6–7 | 1.21(1.09,1.34) ** | 1.14(1.02,1.29) * |
| 7–8 | 1.11(1.01,1.22) * | 1.09(0.98,1.20) |
| 9–10 | 0.99(0.85,1.16) | 1.00(0.85,1.17) |
| ≥ 10 | 0.93(0.72,1.20) | 0.93(0.71,1.21) |
| Weekday sleep duration(h) | ||
| 8–9(ref) | 1.00 | 1.00 |
| < 6 | 1.58(1.37,1.83) ** | 1.24(1.05,1.45) * |
| 6–7 | 1.15(1.04,1.28) * | 1.09(0.97,1.23) |
| 7–8 | 1.16(1.05,1.28) * | 1.18(1.06,1.31) * |
| 9–10 | 1.05(0.90,1.23) | 1.06(0.90,1.25) |
| ≥ 10 | 0.94(0.75,1.19) | 0.94(0.74,1.20) |
| Weekend sleep duration(h) | ||
| 8–9(ref) | 1.00 | 1.00 |
| < 6 | 2.10(1.65,1.68) ** | 1.55(1.20,2.01) * |
| 6–7 | 1.31(1.11,1.56) * | 1.15(0.96,1.38) |
| 7–8 | 1.16(1.01,1.32) * | 1.13(0.98,1.30) |
| 9–10 | 1.01(0.91,1.12) | 1.05(0.93,1.17) |
| ≥ 10 | 1.03(0.94,1.13) | 0.96(0.87,1.06) |
| Weekend catch-up sleep(h) | ||
| 0–1(ref) | 1.00 | 1.00 |
| < 0 | 1.69(1.43,1.99) ** | 1.38(1.16,1.64) ** |
| 1–2 | 1.01(0.89,1.14) | 1.02(0.90,1.17) |
| 2–3 | 1.14(1.01,1.29) * | 1.11(0.98,1.26) |
| ≥ 3 | 1.25(1.11,1.41) ** | 1.08(0.95,1.22) |
* P < 0.05, ** P < 0.001; OR is odds ratios; CI is confidence interval; NSSI is non-suicidal self-injury; Adjusted model controlled regional areas, sex, grade, only child, parents’ education level, family economic status, sleep quality, psychological symptoms, weekday video time, weekend video time, weekday video game time, weekend video game time