Only a few European countries have carried out large, community-based, national surveys about psychiatric morbidity. Here is presented the first national French survey, aiming to estimate the prevalence of anxiety disorders and associated comorbidities according to sociodemographic characteristics.

The Mental Health in General Population (MHGP) database is derived from a representative national survey of the French adult population (n = 36,105), conducted between 1999 and 2003. Data collection was done using an anonymous face-to-face interview. The presence of anxiety disorders (generalized anxiety disorder, panic disorder, agoraphobia, social phobia and post-traumatic stress disorder) was assessed using the Mini International Neuropsychiatric Interview.

The overall prevalence of anxiety disorders was estimated to be 21.6%, generalized anxiety disorder being the most prevalent one (12.8%). Women, young people, and people earning low income were identified as the more at risk. Major depressive episode, alcohol abuse and drug addiction frequently co-occur with anxiety disorders (28.3, 4.4 and 2.8% respectively).

The MHGP study showed that anxiety disorders are highly prevalent in France with a high frequency of comorbidities. Our results highlight the need for considering anxiety disorders as a public health priority in France as well as in other European countries.

Cognitive functioning in anxiety disorders has received little investigation, particularly among young adults and in non-clinical samples. The present study examined cognitive functioning in a population-based sample of young adults with anxiety disorders in comparison to healthy peers.

A population-based sample of 21–35-year-olds with a lifetime history of anxiety disorders (n = 75) and a random sample of healthy controls (n = 71) derived from the same population were compared in terms of performance in neuropsychological tests measuring verbal and visual short-term memory, verbal long-term memory, attention, psychomotor processing speed, and executive functioning.

In general, young adults with anxiety disorders did not have major cognitive impairments when compared to healthy peers. When participants with anxiety disorder in remission were excluded, persons with current anxiety disorder scored lower in visual working memory tests. Current psychotropic medication use and low current psychosocial functioning associated with deficits in executive functioning, psychomotor processing speed, and visual short-term memory.

Lifetime history of anxiety disorders is not associated with cognitive impairment among young adults in the general population. However, among persons with anxiety disorders, current psychotropic medication use and low psychosocial functioning, indicating more severe symptoms, may associate with cognitive impairments.

The epidemiology of panic disorder has not been investigated in the past in the UK using a nationally representative sample of the population. The aim of the present paper was to examine the epidemiology, comorbidity and functional impairment of subthreshold panic and panic disorder with or without agoraphobia.

We used data from the 2000 Office for National Statistics Psychiatric Morbidity survey (N = 8580). Panic disorder and agoraphobia were assessed with the Revised Clinical Interview Schedule (CIS-R).

The prevalence of panic disorder with or without agoraphobia was 1.70% (95% confidence interval: 1.41–2.03%). Subthreshold panic was more common. Economic inactivity was consistently associated with all syndromes. The comorbidity pattern of the panic syndromes and the associated functional impairment show that panic-related conditions are important public health problems, even in subthreshold status.

The findings show that efforts to reduce the disability associated with psychiatric disorders should include detection and management of panic disorder.

Anxiety frequently accompanies low-grade inflammation-associated conditions like depression, insulin resistance, coronary heart disease and metabolic syndrome. The association between anxiety and low-grade inflammation is, unlike between depression and low-grade inflammation, a very sparsely studied area in general populations. The aim of the present study was to investigate whether anxiety symptoms as well as comorbid anxiety and depressive symptoms are associated with low-grade inflammation at population level.

The general population-based Northern Finland 1966 Birth Cohort was followed until age 31 (n = 2688 males and 2837 females), when the highly sensitive CRP concentrations were measured. Anxiety and depressive symptoms were defined by Hopkins Symptom Checklist-25 (HSCL-25).

After adjusting for confounders, logistic regression analyses showed that anxiety symptoms alone increased the probability for elevated hs-CRP levels (> 3.0 mg/L) in males over two-fold (2.19 CI 95% 1.08–4.46), while comorbid anxiety and depressive symptoms caused a 1.7-fold (1.76 CI 95% 1.13–2.74) increase in the probability for elevated hs-CRP levels (1.0–3.0 mg/L).

Our results support the hypothesis that anxiety as well as comorbid anxiety and depression can be associated with an increased risk for low-grade inflammation in males at population level.

To check whether the presence or not of free intervals between episodes could help differentiate subtypes of bipolar disorder, as suggested by the seminal controversy between Falret and Baillarger.

From 1090 bipolar I patients included in a French national study, 981 could be classified as with or without free intervals and assessed for demographic and illness characteristics.

Compared with patients with free intervals (n = 722), those without (n = 259) had an earlier age at onset, more episodes, suicide attempts, cyclothymic and irritable temperaments. The following independent variables were associated with no free intervals: being single or divorced, delay to mood stabilizer treatment, multiple hospitalizations, incongruent psychotic features, panic and generalized anxiety disorder.

“Folie à double forme” (without free intervals) and “folie circulaire” (with free intervals) may actually refer to early and later onset bipolar subtypes, insofar as most differences we found between them were previously evidenced between the latter two. We cannot, however, exclude that they might simply be two separate subtypes, whose main characteristics could be accounted for by different explanatory factors.

We studied the associations between Attention Deficit Hyperactivity Disorder (ADHD) symptoms and the neurobehavioral status in two population-based birth cohorts.

Children (n = 467) were assessed by psychologists and teachers for neuropsychological functioning (McCarthy Scales, MCSA), inattention-hyperactivity symptoms (ADHD-DSM-IV form list) and social behavior (California Preschool Social Competence Scale, CPSCS). Regression models were used with covariate adjustment.

Sixteen percent of children had ADHD-DSM-IV symptoms. MCSA scores were linearly associated with ADHD symptom scores (general cognitive Beta = −0.6 [−1.0; −0.3] per symptom), specifically inattention scores (general cognitive Beta = −1.8 [−2.3; −1.2]). CPSCS scores were associated with ADHD symptoms (Beta = −2.19 [−2.5; −1.9]). MCSA scores of executive function, perceptive-performance and quantitative sub-areas had stronger associations with ADHD symptoms.

Preschooler ADHD symptoms are associated with concurrent decrements in neurocognitive and social competence functioning. The association patterns are similar to those found in older children with ADHD symptomology (Marks et al., 2005 [36], Seidman, 2006 [46], Sonuga-Barke et al., 2003 [48], Yochman et al., 2006 [53]).

Associations have been described between lower IQ and serious mental illness. Associations between common mental disorders (CMDs) and IQ have received little research. The objective of this study was to investigate the association between verbal IQ and CMD symptoms and diagnoses, and to investigate the role of potential mediating and confounding factors.

Data were analysed from a British national survey with an analysed sample of 8054 people aged 16–74 years. Associations between verbal IQ (NART) and mental symptoms/disorders (CIS-R) were analysed with covariates including education, social class, income, debt, problem drinking, life events, physical health and relationship quality.

CMD was associated with lower IQ. This association was stronger for depressive disorder/symptoms than for generalised anxiety disorder/symptoms. The most important covariates were education, social class, income and relationship quality.

The association between lower IQ and CMD is partly accounted for by adverse social/socioeconomic conditions. Stronger associations for depression than anxiety may indicate an effect of IQ on the way mental distress is communicated.

Studies of psychotic-like experiences (PLEs) within community samples of adolescents have explored predominantly positive experiences. There is a paucity of research examining the prevalence and correlates of negative PLEs, and whether particular subtypes of negative PLEs can be identified among the general population of adolescents. This study examined the association of both positive and negative PLEs with depressive symptoms, including detailed analysis of subtypes of positive and negative psychosis dimensions.

A community sample of 777 adolescents (50.9% girls: mean age 14.4 years) completed a questionnaire assessing positive and negative PLEs and depressive symptoms.

Principal component factor analysis identified four factors of positive symptoms (persecutory ideation, grandiose thinking, first-rank/hallucinatory experiences and self-referential thinking), and three factors of negative symptoms (social withdrawal, affective flattening, and avolition). Depressive symptoms were associated positively with persecutory ideation, first-rank/hallucinatory experiences, social withdrawal, and avolition, whereas grandiose thinking related negatively with depressive symptoms. Neither self-referential thinking nor affective flattening related to self-reported depression.

These findings support the view that not all types of positive and negative PLEs in adolescence are associated with depression and, therefore, they may not confer the same vulnerability for psychotic disorders.