Standardised criteria for classifying the International Classification of Activities for Time-use Statistics (ICATUS) activity groups into sleep, sedentary behaviour, and physical activity

Background Globally, the International Classification of Activities for Time-Use Statistics (ICATUS) is one of the most widely used time-use classifications to identify time spent in various activities. Comprehensive 24-h activities that can be extracted from ICATUS provide possible implications for the use of time-use data in relation to activity-health associations; however, these activities are not classified in a way that makes such analysis feasible. This study, therefore, aimed to develop criteria for classifying ICATUS activities into sleep, sedentary behaviour (SB), light physical activity (LPA), and moderate-to-vigorous physical activity (MVPA), based on expert assessment. Method We classified activities from the Trial ICATUS 2005 and final ICATUS 2016. One author assigned METs and codes for wakefulness status and posture, to all subclass activities in the Trial ICATUS 2005. Once coded, one author matched the most detailed level of activities from the ICATUS 2016 with the corresponding activities in the Trial ICATUS 2005, where applicable. The assessment and harmonisation of each ICATUS activity were reviewed independently and anonymously by four experts, as part of a Delphi process. Given a large number of ICATUS activities, four separate Delphi panels were formed for this purpose. A series of Delphi survey rounds were repeated until a consensus among all experts was reached. Results Consensus about harmonisation and classification of ICATUS activities was reached by the third round of the Delphi survey in all four panels. A total of 542 activities were classified into sleep, SB, LPA, and MVPA categories. Of these, 390 activities were from the Trial ICATUS 2005 and 152 activities were from the final ICATUS 2016. The majority of ICATUS 2016 activities were harmonised into the ICATUS activity groups (n = 143). Conclusions Based on expert consensus, we developed a classification system that enables ICATUS-based time-use data to be classified into sleep, SB, LPA, and MVPA categories. Adoption and consistent use of this classification system will facilitate standardisation of time-use data processing for the purpose of sleep, SB and physical activity research, and improve between-study comparability. Future studies should test the applicability of the classification system by applying it to empirical data

Gender, mobility and parental shares of daily travel with and for children: a cross-national time use comparison

Daily mobility varies by gender and is likely related to contextual factors including the gender division of employment and family work, options for modes of transport, and support for work-family reconciliation. This paper compares travel time patterns of men and women using nationally representative time-diary data from Australia, the UK, Spain and Finland (n = 14,176). Despite similarities in men and women's total travel time within countries, results show substantial gender variation in the purpose of daily travel, the transport mode used, who is present, and the way parents in couple-headed households share travel with and for children in relative terms. The extent of the gender gaps vary cross-nationally in ways consistent with prevalent patterns in the gendered division of labour and social parenting norms, but relative gaps in child-serving travel were universal, attesting to the ubiquity of gendered mobility constraints in households with children

Gendered Shares of the Family Rush Hour in Fulltime Dual Earner Families. A Cross National Comparison

There are recognised cross-national differences in the average amount and gender division of paid work and unpaid domestic work and care, but country differences between men and women in the timing and intensity of this daily workload remain under-investigated. Using couple-level time-use data from Australia, the UK, Finland, Korea and Spain (n = 1838), we probe cross-national differences in gendered time availability and constraint, focusing particularly on the early evening ‘family rush hour’. We identify daily time periods during which one partner in a fulltime dual-earner parent couple performs routine time-critical household labor and care, whilst the other partner is simultaneously at leisure. In all five countries fathers in dual fulltime earner couples are more likely than mothers to be at leisure whilst their partner does unpaid work, and this disparity occurs most in the early evening. Multivariate analyses reveal the unpaid work-leisure gap is widest in Korea and narrowest in the UK, confounding expectations that social democratic Finland would be most equitable in this measure

Young people's daily activity in a globalized world: a cross-national comparison using time use data

How much do young people’s daily activities differ according to where they live? As a global generation, young people are disproportionally subject to the risks and insecurity of globalization. However, countries differ in their support for young people’s inclusion through economic and social participation. Using time use surveys from Australia, Italy, Finland, France, Korea, Spain, the UK and the USA (n=23,271), this paper investigates national differences in the amount of time young people (20-34 years) spend on paid and unpaid work, study and leisure in each country. Gender gaps in market work and non-market work were widest in the Anglo and southern European countries. In France and Finland, gender differences in daily market and non-market activity were narrower. Young women spent more daily time in study than young men in all countries except Korea, where study time was highest. Young men and young women in social democratic Finland had more leisure time than young people elsewhere. Results suggest that young people’s experience of the consequences of globalization is not universal, but that nation-states remain relevant in determining their welfare

Australian mothering in cross-national perspective: Time allocation, gender gaps, scheduling and subjective time pressure

Motherhood brings significant change in the way women spend and experience their time. Having children is an intensely personal experience. Yet, much of the practical impact upon mothers’ time is shaped by the social organisation of work and care, which means the daily demands of parenting and child-raising vary over time and place. This chapter uses nationally representative time use surveys from four countries (Australia, Finland, Korea and Spain) to compare parents’ overall workloads when paid and unpaid work is scheduled over the day and week, gender divisions of work and care and the subjective time pressure associated with transitions to parenthood. It discusses how the findings relate to family policy, national work time regimes and social attitudes towards gender roles, mothering and fatherhood

Active Participation and Well-Being Among the Elderly in Belgium and the USA: A Cross-National Time-Use Perspective

Active participation of the elderly is a recognized response to address the societal and individual challenges of rising life expectancy such as releasing the pressure of age-related public spending, reducing social isolation and improving well-being. How much time older people devote to active participation and whether their time allocation is associated with well-being remains under-investigated. Using time-use data from Belgium (n = 1384) and the USA (n = 2133), we investigate the time older people (65–80 years) spent on active participation and examine how this relates to their life satisfaction as an indicator of wellbeing. The countries vary in the amount of time spent on paid employment and volunteering, but not on informal help. Belgian older people spend much less time on paid employment than their American counterparts. This implies more are available to volunteer and provide informal help. Yet participation rates in these activities are higher in the USA. Multivariate analyses show that associations between active participation and life satisfaction vary between both countries and within both countries by gender and age. Overall, positive associations between paid work and volunteering and life satisfaction suggest that governments would do well to mobilize elderly into active participation, especially in Belgium. Negative associations between informal help and life satisfaction suggest governments should provide greater support for informal carers

Does Extremely Low Birth Weight Predispose to Low-Renin Hypertension?

Low birth weight and prematurity are risk factors for hypertension in adulthood. Few studies in preterm or fullterm born children reported on plasma renin activity (PRA). We tested the hypothesis that renin might modulate the incidence of hypertension associated with prematurity. We enrolled 93 prematurely born children with birth weight <1000 g and 87 healthy controls born at term, who were all examined at approximate to 11 years. Renal length and glomerular filtration rate derived from serum cystatin C were 0.28 cm (95% confidence interval, 0.09-0.47) and 11.5 mL/min per 1.73 m(2) (6.4-16.6) lower in cases, whereas their systolic/diastolic blood pressure (BP) was 7.5 mm Hg (4.8-10.3)/4.0 mm Hg (2.1-5.8) higher (P < 0.001 for all). The odds of having systolic prehypertension or systolic hypertension associated with extreme low birth weight were 6.43 (2.52-16.4; P < 0.001) and 10.9 (2.46-48.4; P = 0.002). Twenty-four hours of urinary sodium excretion was similar in cases and controls (102.1 versus 106.8 mmol; P = 0.47). Sodium load per nephron was estimated as sodium excretion divided by kidney length (mmol/cm). PRA was 0.54 ng/mL per hour (0.23-0.85; P = 0.001) lower in cases. PRA, systolic BP, and sodium load were available in 43 cases and 56 controls. PRA decreased with systolic BP (slope -0.022 ng/mL per hour/-(mm Hg); P = 0.048), but was unrelated to sodium load (slope + 0.13 mmol/cm(-mm Hg); P = 0.54). The slope of PRA on systolic BP was similar (P = 0.17) in cases and controls. In conclusion, extremely low birth weight predisposes young adolescents to low-renin hypertension, but does not affect the inverse association between PRA and BP

Does Extremely Low Birth Weight Predispose to Low-Renin Hypertension?

Low birth weight and prematurity are risk factors for hypertension in adulthood. Few studies in preterm or fullterm born children reported on plasma renin activity (PRA). We tested the hypothesis that renin might modulate the incidence of hypertension associated with prematurity. We enrolled 93 prematurely born children with birth weight <1000 g and 87 healthy controls born at term, who were all examined at approximate to 11 years. Renal length and glomerular filtration rate derived from serum cystatin C were 0.28 cm (95% confidence interval, 0.09-0.47) and 11.5 mL/min per 1.73 m(2) (6.4-16.6) lower in cases, whereas their systolic/diastolic blood pressure (BP) was 7.5 mm Hg (4.8-10.3)/4.0 mm Hg (2.1-5.8) higher (P < 0.001 for all). The odds of having systolic prehypertension or systolic hypertension associated with extreme low birth weight were 6.43 (2.52-16.4; P < 0.001) and 10.9 (2.46-48.4; P = 0.002). Twenty-four hours of urinary sodium excretion was similar in cases and controls (102.1 versus 106.8 mmol; P = 0.47). Sodium load per nephron was estimated as sodium excretion divided by kidney length (mmol/cm). PRA was 0.54 ng/mL per hour (0.23-0.85; P = 0.001) lower in cases. PRA, systolic BP, and sodium load were available in 43 cases and 56 controls. PRA decreased with systolic BP (slope -0.022 ng/mL per hour/-(mm Hg); P = 0.048), but was unrelated to sodium load (slope + 0.13 mmol/cm(-mm Hg); P = 0.54). The slope of PRA on systolic BP was similar (P = 0.17) in cases and controls. In conclusion, extremely low birth weight predisposes young adolescents to low-renin hypertension, but does not affect the inverse association between PRA and BP