ABSTRACT
Background/Aims@#The role of psychiatric disorder in irritable bowel syndrome (IBS) is not clear. This study aims to assess whether individuals who have psychiatric disorder prior to IBS onset differ in their risk factors from the remainder. @*Methods@#The prospective, population-based Lifelines cohort study includes 132 922 adults without prior IBS or taking IBS medication at baseline. Baseline data included socio-demographic status, physical and psychiatric disorders, psycho-social and behavioral variables.At follow-up (mean 2.4 years later) new onsets of IBS were recorded by self-report. The predictors of new onsets of IBS were assessed using logistic regression; participants with and without prior psychiatric disorders were analyzed separately. @*Results@#At follow-up 1507 (1.1%) participants reported new onset IBS. Of these, 27% reported prior psychiatric disorder. Predictors of IBS in this group were: 2 or more psychiatric disorders (OR, 2.74; 95% CI, 1.3-5.6), female sex, proton pump inhibitors, numerous bodily symptoms, impaired sleep, low BMI and negative health perception. These variables, except psychiatric disorders and BMI, also predicted IBS in those without prior psychiatric disorder but, in this group, gallstones, asthma, fibromyalgia, reported allergies, impairment through bodily pain, and frequent healthcare were also predictors. @*Conclusions@#Despite its limitations this study suggests that prior psychiatric disorder is an important risk factor in a quarter of IBS onsets. Negative health perception and multiple bodily symptoms are associated with all IBS onsets in line with the cognitive-behavior model of IBS. Prior psychiatric disorder may predict an optimal response to psychiatric treatment. Further studies could usefully study mechanisms linking IBS to prior psychiatric disorder.
ABSTRACT
To apply ROC analysis to select the best threshold scores for the PHQ and SRQ; to compare the sensitivity and specificity of the PHQ and SRQ against a criterion diagnosis of depressive disorder in a community sample in rural Pakistan, and to examine the influence of socio-demographic factors on misclassification. The study used a two-stage design. Receiver Operating Characteristic [ROC] analysis was used to estimate the optimal threshold score and to compare the ability of the Self Reporting Questionnaire [SRQ] and the Personal Health Questionnaire [PHQ] to discriminate between cases of depressive disorder and non-cases. The results of the ROC analysis suggest that the SRQ is superior to the PHQ, and at the threshold of 5/6, the SRQ has superior sensitivity, negative predictive value and percentage agreement compared with the PHQ. When the SRQ threshold is raised it gains specificity, and at a cut-off threshold of 7/8 it is superior to the PHQ [5/6] in all validity coefficients and percentage agreement. Only gender and the presence of a confidant had a significant effect on misclassification using the SRQ among the cases. Both questionnaires performed better for females based on comparison of the areas under the ROC curves. This study has demonstrated that the Urdu translations of both the PHQ and SRQ can be used as screening tests for depressive disorder in the Pakistani population. People with little or no education answer both somatic and psychological items with equal ease. In conclusion, the PHQ does not appear to have any advantage over the SRQ