Predictors of treatment dropout in self-guided web-based interventions for depression: an 'individual patient data' meta-analysis.

BACKGROUND: It is well known that web-based interventions can be effective treatments for depression. However, dropout rates in web-based interventions are typically high, especially in self-guided web-based interventions. Rigorous empirical evidence regarding factors influencing dropout in self-guided web-based interventions is lacking due to small study sample sizes. In this paper we examined predictors of dropout in an individual patient data meta-analysis to gain a better understanding of who may benefit from these interventions. METHOD: A comprehensive literature search for all randomized controlled trials (RCTs) of psychotherapy for adults with depression from 2006 to January 2013 was conducted. Next, we approached authors to collect the primary data of the selected studies. Predictors of dropout, such as socio-demographic, clinical, and intervention characteristics were examined. RESULTS: Data from 2705 participants across ten RCTs of self-guided web-based interventions for depression were analysed. The multivariate analysis indicated that male gender [relative risk (RR) 1.08], lower educational level (primary education, RR 1.26) and co-morbid anxiety symptoms (RR 1.18) significantly increased the risk of dropping out, while for every additional 4 years of age, the risk of dropping out significantly decreased (RR 0.94). CONCLUSIONS: Dropout can be predicted by several variables and is not randomly distributed. This knowledge may inform tailoring of online self-help interventions to prevent dropout in identified groups at risk.

Prevalence, course and determinants of carpal tunnel syndrome symptoms during pregnancy: a prospective study.

OBJECTIVE: To investigate the prevalence, severity and relation to fluid retention of self-reported pregnancy-related carpal tunnel syndrome (CTS) symptoms in a large sample of pregnant women. DESIGN: A prospective longitudinal cohort study. SETTING: Dutch women who became pregnant between January 2013 and January 2014 in the southeast of The Netherlands. POPULATION OR SAMPLE: A total of 639 Dutch pregnant women. METHODS: Baseline characteristics were assessed at 12 weeks' gestation. CTS symptoms were assessed using the Boston Carpal Tunnel Questionnaire (BCTQ) at 32 weeks and during the first postpartum week regarding the last weeks of pregnancy. Fluid retention, sleeping problems and depressive symptoms (using the Edinburgh Depression Scale) were assessed at several time points during pregnancy. MAIN OUTCOME MEASURES: BCTQ scores, fluid retention and sleeping problems. RESULTS: Of the 639 women, 219 (34%) reported CTS symptoms during pregnancy. Total mean scores on the BCTQ were significantly higher after 32 weeks' than up to 32 weeks' gestation. Most women experienced mild to moderate symptoms. Pregnant women with CTS symptoms reported significantly higher levels of fluid retention during gestation compared with pregnant women without CTS symptoms [F = 60.6, df (1598), P < 0.001], adjusted for body mass index (BMI), age, parity, and depression scores. Higher scores on fluid retention throughout the pregnancy were significantly related to CTS (OR = 1.8, 95%CI 1.5, 2.1, P < 0.001). Finally, the occurrence of CTS was independently related to sleeping problems. CONCLUSIONS: Although the severity of symptoms and functional impairment of CTS were relatively mild, health care professionals should be aware of the high prevalence. The occurrence of CTS symptoms is significantly higher in women who report fluid retention during gestation and it can contribute to sleeping problems.

Alexithymia and cognitive behaviour therapy outcome for subthreshold depression.

OBJECTIVE: Alexithymia is hypothesized to be a stable trait that hinders favourable outcomes of psychotherapy. We tested two hypotheses: i) alexithymia is not stable but changes along with a change in depressive symptoms and ii) pretreatment alexithymia hinders gaining benefits from psychotherapy. METHOD: A total of 201 participants (mean age = 54 years, SD = 4.4) with subthreshold depression were treated with cognitive behaviour therapy. Outcome was defined as the change in depressive symptoms from pretreatment to post-treatment and to 1-year follow-up. RESULTS: Changes in depressive symptoms were significantly correlated with changes in alexithymia. Baseline alexithymia scores were not correlated with treatment outcome. CONCLUSION: Alexithymia is less stable than hypothesized: changes in alexithymia were associated with change in depressive symptoms. Furthermore, alexithymia does not hinder cognitive behaviour therapy outcome.

One-year follow-up results of a randomized controlled clinical trial on internet-based cognitive behavioural therapy for subthreshold depression in people over 50 years.

BACKGROUND: Internet-based cognitive behaviour therapy (CBT) is a promising new approach for the treatment of depressive symptoms. The current study had two aims: (1) to determine whether, after 1 year, an internet-based CBT intervention was more effective than a waiting-list control group; and (2) to determine whether the effect of the internet-based CBT differed from the group CBT intervention, 1 year after the start of treatment. METHOD: A total of 191 women and 110 men (mean age=55 years, s.d.=4.6) with subthreshold depression were randomized into internet-based treatment, group CBT (Lewinsohn's Coping with Depression Course), or a waiting-list control condition. The main outcome measure was treatment response after 1 year, defined as the difference in pretreatment and follow-up scores on the Beck Depression Inventory (BDI). Missing data were imputed using the multiple imputation procedure of data augmentation. Analyses were performed using multiple imputation inference. RESULTS: In the waiting-list control group, we found a pretreatment to follow-up improvement effect size of 0.69, which was 0.62 in the group CBT condition and 1.22 with the internet-based treatment condition. Simple contrasts showed a significant difference between the waiting-list condition and internet-based treatment (p=0.03) and no difference between both treatment conditions (p=0.08). CONCLUSIONS: People aged over 50 years with subthreshold depression can still benefit from internet-based CBT 1 year after the start of treatment.