Independence, well-being, and social participation in an aging population.

In 2005 the Health, Work, and Retirement (HWR) Longitudinal Study was established at Massey University in order to identify the later-midlife factors that lay the basis for community participation, independence, and health in later life. Information was collected via postal questionnaire on physical and mental health, psychosocial factors, work and retirement attitudes, and socioeconomic and demographic indicators of a sample of 6662 community-dwelling adults aged 55-70 years. This report provides an overview of these results, and highlights the impact that the transition from work to retirement has on the health and retirement adjustment of older people with respect to independence, well-being, and social participation.

Correlates of body mass index among a nationally representative sample of New Zealand children.

OBJECTIVES: To describe how nutrition behaviours and physical activity are associated with body mass index (BMI) among New Zealand children and to determine if these relationships vary by ethnicity. METHODS: Data were collected during the 2002 National Children's Nutrition Survey. 3250 children provided information about their eating and activity behaviours and anthropometric measurements. RESULTS: Approximately 31% of New Zealand children aged 5 to 14 years were overweight/obese, with the highest prevalences of overweight/obesity among Pacific children (62%) and Mäori children (41%). Higher prevalences of obesity were also observed among females and children experiencing socioeconomic deprivation. Television use, buying school food from the dairy/takeaway shops, skipping breakfast, consumption of fruit drinks/soft drinks, and low physical activity were associated with BMI in analyses controlling for demographic characteristics among the total population. Buying school food from the dairy/takeaway (p=0.04) and skipping breakfast (p=0.007) retained significance when all nutrition behaviours and physical activity were analysed simultaneously. Significant interactions between ethnicity and bringing school food from home and buying school food from school were observed in relation to BMI. In most cases, the relationships were most significant for Pacific children. CONCLUSIONS: Strategies to address childhood obesity among all New Zealand children should primarily include efforts to increase breakfast consumption and decrease food purchases away from home. Given the high rates of obesity between Pacific and Mäori children, targeted interventions are warranted and should include strategies to improve the school food environment.

Serum selenium concentrations and dietary selenium intake of New Zealand children aged 5-14 years.

Serum Se concentrations and dietary Se intakes have been determined in relation to age, sex, ethnicity, region and index of deprivation in a nationally representative sample of New Zealand children aged 5-14 years from the 2002 National Children's Nutrition Survey. Dietary intake was assessed from computer-assisted, multiple-pass 24 h diet recall interviews (n 3275). Serum Se concentrations were obtained from a subset of urban-based children (n 1547). Mean (95 % CI) serum Se concentration in children was 0.96 (0.93, 1.00) micromol/l. Males (1.00 micromol/l) had higher serum Se levels than females (0.93 micromol/l; P = 0.027). Mäori children had lower serum Se than Pacific Islands children (P = 0.038) and New Zealand European and Other children (P = 0.005). Children in the Upper North Island (1.06 micromol/l) had higher mean serum Se values than those in the Lower North Island (0.98 micromol/l, P < 0.0005) and South Island (0.79 micromol/l, P < 0.0005), and serum Se in the Lower North Island was higher than that in the South Island (P < 0.0005). Mean dietary Se intake was 36 (34, 37) microg/d. The intakes of children aged 5-6 years (31 microg/d) were lower than those of children aged 7-10 and 11-14 years (35 and 38 microg/d, respectively; P < 0.00 005) and the intakes of 7-10-year-olds were lower than those of 11-14-year-olds (P = 0.002). Serum Se was associated with dietary Se after adjusting for all variables, including region (P = 0.006). The Se status of our children falls in the middle of the international range of serum Se concentrations, but that for children in the South Island is among the lowest values reported and may be a cause for concern.

Nutrition and physical activity behaviours among Mäori, Pacific and NZ European children: identifying opportunities for population-based interventions.

OBJECTIVES: To describe how the prevalences of nutrition and physical activity behaviours vary by ethnicity, while controlling for other socio-demographic characteristics, and to identify appropriate points of intervention for defined ethnic populations of New Zealand children. METHODS: Secondary data analysis of the 2002 National Children's Nutrition Survey. RESULTS: Few ethnic differences were significant for fruit and vegetable consumption and indicators of physical activity. Where ethnic differences in physical activity were significant, Mäori children and Pacific children were more active than New Zealand European/Other (NZEO) children. Pacific children and, Mäori children were significantly more likely to skip meals than NZEO children. Pacific children and Mäori children were significantly more likely to buy some/most of the food they consumed at school from the tuckshop or dairy while NZEO children were more likely to bring their school food only from home. Likewise, Pacific children and Mäori children were significantly more likely to be high consumers of some fatty and sugary foods than NZEO children. CONCLUSIONS AND IMPLICATIONS: Meal skipping and purchasing food away from home were common for Mäori children and Pacific children; school-based programs that aim to improve access to and subsidise the price of healthy foods, including breakfast, could greatly benefit Mäori and Pacific students. Efforts to improve fruit and vegetable consumption and physical activity should be more universally applied and made culturally appropriate for all children.

Season and ethnicity are determinants of serum 25-hydroxyvitamin D concentrations in New Zealand children aged 5-14 y.

New Zealand children, particularly those of Maori and Pacific ethnicity, may be at risk for low vitamin D status because of low vitamin D intakes, the country's latitude (35-46 degrees S), and skin color. The aim of this study was to determine 25-hydroxyvitamin D concentrations and their determinants in a national sample of New Zealand children aged 5-14 y. The 2002 National Children's Nutrition Survey was designed to survey New Zealand children, including oversampling of Maori and Pacific children to allow ethnic-specific analyses. A 2-stage recruitment process occurred using a random selection of schools, and children within each school. Serum 25-hydroxyvitamin D concentration [mean (99% CI) nmol/L] in Maori children (n = 456) was 43 (38,49), in Pacific (n = 646) 36 (31,42), and in New Zealand European and Others (NZEO) (n = 483) 53 (47,59). Among Maori, Pacific, and NZEO, the prevalence (%, 99% CI) of serum 25-hydroxyvitamin D deficiency (<17.5 nmol/L) was 5 (2,12), 8 (5,14), and 3 (1,7), respectively. The prevalence of insufficiency (<37.5 nmol/L) was 41 (29,53), 59 (42,75), and 25 (15,35), respectively. Multiple regression analysis found that 25-hydroxyvitamin D concentrations were lower in winter than summer [adjusted mean difference (99% CI) nmol/L; 15 (8,22)], lower in girls than boys [5 (1,10)], and lower in obese children than in those of "normal" weight [6 (1,11)]. Relative to NZEO, 25-hydroxyvitamin D concentrations were lower in Maori [9 (3,15)] and Pacific children [16 (10,22)]. Ethnicity and season are major determinants of serum 25-hydroxyvitamin D. There is a high prevalence of vitamin D insufficiency in New Zealand children, which may or may not contribute to increased risk of osteoporosis and other chronic disease. There is a pressing need for more convincing evidence concerning the health risks associated with the low vitamin D status in New Zealand children.