Seroprevalence of SARS-CoV-2 antibodies in Saint Petersburg, Russia: a population-based study

Properly conducted serological survey can help determine infection disease true spread. This study aims to estimate the seroprevalence of SARS-CoV-2 antibodies in Saint Petersburg, Russia accounting for non-response bias. A sample of adults was recruited with random digit dialling, interviewed and invited for anti-SARS-CoV-2 antibodies. The seroprevalence was corrected with the aid of the bivariate probit model that jointly estimated individual propensity to agree to participate in the survey and seropositivity. 66,250 individuals were contacted, 6,440 adults agreed to be interviewed and blood samples were obtained from 1,038 participants between May 27 and June 26, 2020. Naïve seroprevalence corrected for test characteristics was 9.0% (7.2–10.8) by CMIA and 10.5% (8.6–12.4) by ELISA. Correction for non-response decreased estimates to 7.4% (5.7–9.2) and 9.1% (7.2–10.9) for CMIA and ELISA, respectively. The most pronounced decrease in bias-corrected seroprevalence was attributed to the history of any illnesses in the past 3 months and COVID-19 testing. Seroconversion was negatively associated with smoking status, self-reported history of allergies and changes in hand-washing habits. These results suggest that even low estimates of seroprevalence can be an overestimation. Serosurvey design should attempt to identify characteristics that are associated both with participation and seropositivity.

Mobilizing mini-publics: The causal impact of deliberation on civic engagement using panel data

Deliberative exercises may reinvigorate civic life by building citizens’ capacity to engage in other types of civic activities. This study examines members of a citizens’ panel ( n = 56) who participated in a 6-day deliberative event on climate change and energy transition in Edmonton, Alberta (Canada), in 2012. We compared panellists’ civic engagement, political interest, and political knowledge with those of the general population using a concurrent random digit dialling survey conducted 2.5 years after the event ( n = 405). Panellists are more likely to talk about politics, and volunteer in the community compared to their counterparts in the larger population. Examining three points in time, we reveal a trajectory of increasing political knowledge and civic engagement. Finally, we examine the mechanisms that mobilize panellists into greater civic engagement. This study illustrates how deliberative events could strengthen engagement in civic and political life, depending on the degree to which deliberation was perceived to have occurred.

Hardening or softening? An observational study of changes to the prevalence of hardening indicators in Victoria, Australia, 2001–2016

BackgroundThe hardening hypothesis predicts that as smoking prevalence declines, remaining smokers will be more heavily addicted to nicotine and/or less interested in quitting. We tested this hypothesis in a population exposed to a comprehensive tobacco control programme over a 16-year period.MethodsAnnual cross-sectional surveys randomly sampled adults (aged 26+) in the state of Victoria, Australia, between 2001 and 2016. Until 2010, participants were recruited through random digit dialling to landline telephones; from 2011, sampling frames also included mobile phones. Logistic regressions assessed changes over time in the prevalence of smoking and each hardening indicator; additional models examined interactions by sex, age, education and socioeconomic status.ResultsSmoking prevalence declined significantly between 2001 and 2016 (20.1%–13.0%), as did the prevalence of seven hardening indicators: daily smoking, heavy consumption, no quit attempt in the past 5 years or past 12 months, no intention to quit in the next 6 months or next 30 days, and happiness to keep smoking. In addition, the proportion of smokers defined as ‘hardcore’ decreased from 17.2% to 9.1%. On the whole, hardening indicators decreased to a similar extent among demographic subgroups.ConclusionsThese results are inconsistent with the hardening hypothesis. Rather, they suggest that a comprehensive tobacco control programme that combines provision of cessation support to individual smokers with implementation of population-level interventions to drive all smokers towards quitting, can successfully reduce both smoking prevalence and levels of dependence and desire to keep smoking among the remaining population of smokers.

Masturbation, paying for sex, and other sexual activities: the Second Australian Study of Health and Relationships

Background This study describes the prevalence of (solo) masturbation, paying for sex and a range of other sexual practices among Australians. Methods: A representative sample of 20 094 men and women aged 16–69 years (participation rate among eligible people, 66.2%) were recruited by landline and mobile phone random-digit dialling and computer-assisted telephone interviews in 2012–13. Results: Many respondents (men, 72%; women, 42%) had masturbated in the past year. Half (51%) of the men and 24% of women had masturbated in the past 4 weeks. In the past year, more than two-fifths of respondents (men, 63%; women, 20%) had looked at pornography in any medium. Approximately 15% of men and 21% of women had used a sex toy. Digital-anal stimulation with a partner was practised by 19% of men and 15% of women, and oral-anal stimulation by 7% of men and 4% of women. Sexual role playing or dressing up were engaged in by 7–8%. Online sex, swinging, group sex, BDSM (bondage and discipline, ‘sadomasochism’ or dominance and submission) and fisting (rectal or vaginal) were each engaged in by less than 3% of the sample. Seventeen per cent of men said they had ever paid for sex; 2% had done so in the past year. Conclusion: Most of the solo practices studied were engaged in by more men than women, but women were more likely to have used a sex toy. Autoerotic activities are both substitutes for partnered sex and additional sources of pleasure for people with sexual partners.

Family meals and body weight in US adults

ObjectiveFamily meals are an important ritual in contemporary societies and many studies have reported associations of family meals with several biopsychosocial outcomes among children and adolescents. However, few representative analyses of family meals have been conducted in samples of adults, and adults may differ from young people in predictors and outcomes of family meal consumption. We examined the prevalence and predictors of adult family meals and body weight outcomes.DesignThe cross-sectional 2009 Cornell National Social Survey (CNSS) included questions about the frequency of family meals, body weight as BMI and sociodemographic characteristics.SettingThe CNSS telephone survey used random digit dialling to sample individuals.SubjectsWe analysed data from 882 adults living with family members in a nationally representative US sample.ResultsPrevalence of family meals among these adults revealed that 53 % reported eating family meals seven or more times per week. Predictive results revealed that adults who more frequently ate family meals were more likely to be married and less likely to be employed full-time, year-round. Outcome results revealed that the overall frequency of family meals among adults was not significantly associated with any measure of body weight. However, interaction term analysis suggested an inverse association between frequency of family meals and BMI for adults with children in the household, and no association among adults without children.ConclusionsThese findings suggest that family meals among adults are commonplace, associated with marital and work roles, and marginally associated with body weight only in households with children.

Misclassification bias: diversity in conceptualisations about having 'had sex'

Background: Understanding the signification of the word ‘sex’ has implications for both medical research and clinical practice. Little is known about how people of varying ages define sex and how situational qualifiers influence definitions across age groups. To our knowledge, this is the first study of a representative sample to assess attitudes about which sexual behaviours constitute having ‘had sex’ and to examine possible mediating factors (gender, age, giving/receiving stimulation, male ejaculation, female orgasm, condom use or brevity). Methods: A telephone survey of English-speaking residents of Indiana (USA) using random-digit-dialling produced a final sample of 204 men and 282 women (n = 486) ranging in age from 18 to 96 years. Questions assessed the respondents’ attitudes on manual-genital (MG), oral-genital (OG), penile-vaginal intercourse (PVI) and penile-anal intercourse (PAI) behaviours. Results: There was no universal consensus on which behaviours constituted having ‘had sex’. More than 90% responded ‘yes’ to PVI but one in five responded ‘no’ to PAI, three in 10 responded ‘no’ to OG and about half endorsed MG. Fewer endorsed PVI with no male ejaculation (89.1%) compared with PVI without a qualifier (94.8%, P < 0.001). MG was endorsed more often when received (48.1%) than given (44.9%, P < 0.001). Among men, the oldest and youngest age groups were significantly less likely to believe certain behaviours constituted having ‘had sex’. Conclusions: These findings highlight the need to use behaviour-specific terminology in sexual history taking, sex research, sexual health promotion and sex education. Researchers, educators and medical practitioners should exercise caution and not assume that their own definitions of having ‘had sex’ are shared by their research participants or patients.

Acute gastroenteritis in Hong Kong: a population-based telephone survey

SUMMARYA population-based telephone survey of acute gastroenteritis (AG) was conducted in Hong Kong from August 2006 to July 2007. Study subjects were recruited through random digit-dialling with recruitments evenly distributed weekly over the 1-year period. In total, 3743 completed questionnaires were obtained. An AG episode is defined as diarrhoea ⩾3 times or any vomiting in a 24-h period during the 4 weeks prior to interview, in the absence of known non-infectious causes. The prevalence of AG reporting was 7%. An overall rate of 0·91 (95% CI 0·81–1·01) episodes per person-year was observed with women having a slightly higher rate (0·94, 95% CI 0·79–1·08) than men (0·88, 95% CI 0·73–1·04). The mean duration of illness was 3·6 days (s.d.=5·52). Thirty-nine percent consulted a physician, 1·9% submitted a stool sample for testing, and 2·6% were admitted to hospital. Of the subjects aged ⩾15 years, significantly more of those with AG reported eating raw oysters (OR 2·4, 95% CI 1·3–4·4), buffet meals (OR 1·8, 95% CI 1·3–2·5), and partially cooked beef (OR 1·8, 95% CI 1·2–2·7) in the previous 4 weeks compared to the subjects who did not report AG. AG subjects were also more likely to have had hot pot, salad, partially cooked or raw egg or fish, sushi, sashimi, and ‘snacks bought at roadside’ in the previous 4 weeks. This first population-based study on the disease burden of AG in Asia showed that the prevalence of AG in Hong Kong is comparable to that experienced in the West. The study also revealed some ‘risky’ eating practices that are more prevalent in those affected with AG.

Sociodemographic, health and lifestyle characteristics reported by discrete groups of adult dietary supplement users in Alberta, Canada: findings from The Tomorrow Project

ObjectiveTo determine the extent to which differences in sociodemographic, dietary and lifestyle characteristics exist between users of different types of dietary supplements and supplement non-users.DesignWe analysed cross-sectional data obtained from self-administered questionnaires completed at baseline by participants in The Tomorrow Project; a prospective cohort study in Alberta, Canada. Participants who used at least one type of dietary supplement at least weekly in the year prior to questionnaire completion were defined as supplement users, while the remainder were classified as non-users. Seven discrete user categories were created: multivitamins (+/− minerals) only, specific nutritional supplements only, herbal/other supplements only, and all possible combinations. Differences in sociodemographic, dietary and lifestyle characteristics between different groups of supplement users and non-users were analysed using Rao–Scottχ2tests and multinomial logistic regression.Subjects and settingSubjects were 5067 men and 7439 women, aged 35–69 years, recruited by random digit dialling throughout Alberta.ResultsSupplement use was extensive in this study population (69·8 %). Users of herbal/other supplements only, and women who used multivitamins only, tended to report dietary and lifestyle characteristics that were not significantly different from non-users. In contrast, those who reported using a combination of multivitamins, specific nutritional and herbal/other supplements were more likely than non-users to report behaviours and characteristics consistent with current health guidelines.ConclusionsDichotomizing participants as supplement users or non-users is likely to mask further differences in sociodemographic, dietary and lifestyle characteristics among users of different types of supplements. This may have implications for analysis and interpretation of observational studies.