In this study, five different models were tested. Model 1 tested the relationship between awakening time and suicide-related behaviours, adjusted for socioeconomic, health risk and behavioural variables. Model 2 tested the relationship between bedtime and suicide-related behaviours, adjusted for socioeconomic, health risk and behavioural variables. Model 3 tested the relationship among awakening time, bedtime and suicidal thoughts, adjusted for socioeconomic, health risk and behavioural variables. Model 4 tested the relationship between time in bed and suicidal thoughts, adjusted for socioeconomic, health risk and behavioural variables. Model 5 tested the relationship among awakening time, bedtime and duration and suicidal thoughts, adjusted for socioeconomic, health risk and behavioural variables.
To analyse whether general characteristics, health status and health risk behaviour were associated with suicidal thoughts, t tests, χ2 tests and multiple logistic regression analyses were used. For all analyses, a two-tailed p value ≤0.05 was considered to indicate statistical significance. All analyses were conducted using the SAS statistical software package V.9.2 (SAS Institute Inc, Cary, North Carolina, USA).
To analyse whether general characteristics, health status and health risk behaviour were associated with suicidal thoughts, t tests, χ2 tests and multiple logistic regression analyses were used. For all analyses, a two-tailed p value ≤0.05 was considered to indicate statistical significance. All analyses were conducted using the SAS statistical software package V.9.2 (SAS Institute Inc, Cary, North Carolina, USA).