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Table 4 Illustration of different models in this study

From: Prevalence and characteristics of suicidal ideation among 2199 elderly inpatients with surgical or medical conditions in Taiwan

Model 1: Multivariate logistic regression models exploring factors related to SI

1A: Independent variables included age, gender, economic status, perception of poor health, unmarried, QOL-PHY, QOL-PSY, and five items of BSRS-5 item.

1B: Independent variables included: variables were the same as those in the Model 1A except for the variable of BSRS-5 total scores greater than 5, which replaced the BSRS-5 item 1 through 5.

Model 2: Multivariate logistic models exploring the items of WHOQOL-BREF related to SI

2A: Independent variables included BSRS-5 item 2 (depression), item 4 (inferiority), item 5 (insomnia), and all items of QOL-PHY except QOL11 (feeling of bodily appearance) and QOL17 (level of daily activities).

2B: Independent variables: all were the same as those in Model 2A except for the variable of BSRS-5 total scores greater than 5 replacing BSRS-5 item 2 (depression), item 4 (inferiority), item 5 (insomnia).

Model 3: Univariate logistic regression models exploring factors related to MTS-WTD in those who had SI

Independent variables: variables in Model 1A and 28 items of the WHOOQOL-BREF except for the individual sum of four domains of WHOOQOL-BREF, i.e., QOL-PHY, QOL-PSY, QOL-ENV, QOL-SR

Model 4: Comparison between different propensity score models of BSRS-5 predicting SI using ROC curve analysis.

State variable in 4A-4C: propensity score from individual propensity score model

4A: predictor variables included BSRS-5 item 2 (depression), item 4 (inferiority), and item 5 (insomnia)

4B: predictor variable: the variable of BSRS-5 total scores greater than 5

4C: predictor variables included all five items of BSRS-5

  1. SI suicidal ideation, BSRS Brief Symptom Rating Scale, WHOQOL-BREF the World Health Organization Quality of Life-BREF, QOL-PHY physical domain of WHOQOL-BREF, QOL-PSY psychological domain of WHOQOL-BREF, QOL-ENV environmental domain of WHOQOL-BREF, QOL-SR the domain of social relationships of WHOQOL-BREF, QOL quality of life rated with the WHOQOL-BREF, MTS-WTD moderate to severe wish to die, ROC Receiver Operating Characteristic