The interactions of abnormal sleep duration with sleep disturbance and abnormal sleep timing on suicidal ideation.

Among those with early sleep timing, only short sleep duration showed a marginally significant association with SI, with an OR of 2.79 (0.90–8.67; p = 0.07; Table 4 ).

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Similarly, long sleep duration was associated with higher odds of SI only among individuals with late sleep timing, while short sleep duration showed a borderline significant association with greater SI odds among those with early sleep timing.

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Subgroup analyses revealed a significant interaction between sleep timing and sleep duration, whereas the interaction between sleep timing and sleep disturbance did not reach statistical significance (Additional file 4 : Table S4 ).

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