Misreporting month of birth: Implications for nutrition research PDF Download

Author: Larsen, Anna Folke
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 52

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Book Description
Height-for-age z-scores (HAZs) and stunting status (HAZ<−2) are widely used to measure child nutrition and population health. However, accurate measurement of age is nontrivial in populations with low levels of literacy and numeracy, limited use of formal birth records, and weak cultural norms surrounding birthdays and calendar use. In this paper we use Demographic and Health Surveys data from 62 countries over the period 1990–2014 to describe two statistical artifacts indicative of misreporting of age. The first artifact consists of lower HAZs for children reported to be born earlier in each calendar year (resulting in implausibly large HAZ gaps between January- and December-born children), which is consistent with some degree of randomness in month of birth reporting. The second artifact consists of lower HAZs for children with a reported age just below a round age (and hence implausibly large HAZ gaps between children with reported ages just below and just above round ages), which is consistent with survey respondents rounding ages down more than they round ages up. Using simulations, we show how these forms of misreporting child age can replicate observed patterns in the data, and that they have small impacts on estimated rates of stunting but important implications for research that relies on birth timing to identify exposure to various risks, particularly seasonal shocks. Moreover, the misreporting we identify differs from conventional age-heaping concerns, implying that the metrics described above could constitute useful markers of measurement error in nutrition surveys. Future research should also investigate ways to reduce these errors.

Author: Avula, Rasmi, ed.
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 14

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Book Description
We are delighted to present to you the first issue of Abstract Digest for this year. This issue has two important LANCET Commission Reports. The EAT–Lancet Commission is the first of a series of initiatives on nutrition, led by The Lancet in 2019, followed by the Commission on the Global Syndemic of obesity, undernutrition, and climate change. Along with these, we have articles from an issue of Public Health Nutrition that focuses on child and adolescent nutrition, and much more.

Author: Gouel, Christophe
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 34

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Book Description
Estimating future demand for food is a critical aspect of global food security analyses. The process linking dietary changes to wealth is known as the nutrition transition and presents well-identified features that help to predict consumption changes in poor countries. This study proposes to represent the nutrition transition with a nonhomothetic, flexible-in-income, demand system, known as the Modified Implicitly Directly Additive Demand System (MAIDADS). The resulting model is transparent and estimated statistically based on cross-sectional information from FAOSTAT the statistical database of the Food and Agriculture Organization of the United Nations. It captures the main features of the nutrition transition: rise in demand for calories associated with income growth; diversification of diets away from starchy staples; and a large increase in caloric demand for animal-based products, fats, and sweeteners. The estimated model is used to project food demand between 2010 and 2050 based on a set of plausible futures (trend projections and Shared Socioeconomic Pathways scenarios). The main results of these projections are as follows: (1) global food demand will increase by 46 percent, less than half the growth in the previous four decades; (2) this growth will be attributable mainly to lower-middle-income and low-income countries; (3) the structure of global food demand will change over the period, with a 95 percent increase in demand for animal-based calories and a much smaller 18 percent increase in demand for starchy staples; and (4) the analysis of a range of population and income projections reveals important uncertainties depending on the scenario, the projected increases in demand for animal-based and vegetal-based calories range from 78 to 109 percent and from 20 to 42 percent, respectively.

Author: Hill, Ruth Vargas
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 40

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Book Description
It is widely acknowledged that unmitigated risks provide a disincentive for otherwise optimal investments in modern farm inputs. Index insurance provides a means for managing risk without the burdens of asymmetric information and high transaction costs that plague traditional indemnity-based crop insurance programs. Yet many index insurance programs that have been piloted around the world have met with rather limited success, so the potential for insurance to foster more intensive agricultural production has yet to be realized. This study assesses both the demand for and the effectiveness of an innovative index insurance product designed to help smallholder farmers in Bangladesh manage risk to crop yields and the increased production costs associated with drought. Villages were randomized into either an insurance treatment or a comparison group, and discounts and rebates were randomly allocated across treatment villages to encourage insurance take-up and to allow for the estimation of the price elasticity of insurance demand. Among those offered insurance, we find insurance demand to be moderately price elastic, with discounts significantly more successful in stimulating demand than rebates. Farmers who are highly risk averse or sensitive to basis risk prefer a rebate to a discount, suggesting that the rebate may partially offset some of the implicit costs associated with insurance contract nonperformance. Having insurance yields both ex ante risk management effects and ex post income effects on agricultural input use. The risk management effects lead to increased expenditures on inputs during the aman rice-growing season, including expenditures for risky inputs such as fertilizers, as well as those for irrigation and pesticides. The income effects lead to increased seed expenditures during the boro rice-growing season, which may signal insured farmers’ higher rates of seed replacement, which broadens their access to technological improvements embodied in newer seeds as well as enhancing the genetic purity of cultivated seeds.

Author: Derek Headey
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 46

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Book Description
Agricultural development has historically focused on poverty reduction and food security but is now increasingly asked to help improve nutrition. Despite this strengthened nutritional mandate, agricultural policies and programs have struggled to develop effective, scalable and cost-effective approaches for reducing undernutrition. This study was therefore undertaken to assess more the more strategic issue of how to re-design agricultural development strategies for greater nutritional impact. To do so we review the literature on agriculture-nutrition linkages through an economic lens, focusing on systemic agriculture-nutrition linkages that go beyond the much-explored question of how a farm family’s agricultural activities affect their own household members’ food consumption or nutrition outcomes. To that end we structured this review around three types of linkages between agriculture and nutrition: (i) agricultural income effects (including income stability); (ii) relative food price determination (including the shadow prices involved in consuming one’s own production); and (iii) agricultural livelihood characteristics (encompassing the many neglected dimensions of agricultural activities and rural livelihoods that influence nutrition and health). For each of these literatures we reflect upon relevant economic theory, methodological challenges, and key empirical evidence. We conclude with a brief discussion of the implications of these findings for developing more nutrition-sensitive agricultural development strategies.

Author: Wouterse, Fleur Stephanie
Publisher: Intl Food Policy Res Inst
ISBN: 0896295982
Category : Political Science
Languages : en
Pages : 284

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Book Description
Social protection programs—public or private initiatives that aid the poor and protect the vulnerable against livelihood risks—can effectively be used to assist those trapped, or at the risk of being trapped, in chronic poverty. These programs aim to address chronic poverty through redistribution and protect vulnerable households from falling below the poverty line. Although investments in social protection programs are often motivated by equity concerns, they can also contribute to economic growth by, for example, encouraging savings, creating community assets, and addressing market imperfections. Despite their potential and proliferation, not enough is known about social protection programs in Africa. The 2017–2018 Annual Trends and Outlook Report (ATOR) reduces this knowledge gap by focusing on the potential of such programs on the continent and the corresponding opportunities and challenges. The chapters of the Report highlight the benefits of these programs, not only to their direct recipients but also others in the community through spillover effects. They also underscore the importance of appropriate design and sustainability to fully realize the potential of social protection programs.

Author: Chen, Xi
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 43

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Book Description
While there is a large body of literature on the negative health effects of air pollution, there is much less written about its effects on cognitive performance for the whole population. This paper studies the effects of contemporaneous and cumulative exposure to air pollution on cognitive performance based on a nationally representative survey in China. By merging a longitudinal sample at the individual level with local air-quality data according to the exact dates and counties of interviews, we find that contemporaneous and cumulative exposure to air pollution impedes both verbal and math scores of survey subjects. Interestingly, the negative effect is stronger for men than for women. Specifically, the gender difference is more salient among the old and less educated in both verbal and math tests.

Author: Abate, Gashaw T.
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 44

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Book Description
Adoption of quality-enhancing technologies is often driven largely by farmers’ expected returns from these technologies. Without proper grades, standards, and certification systems, however, farmers may remain uncertain about the actual financial return associated with their quality-enhancing investments. This report summarizes the outcomes of a short video-based randomized training intervention on wheat quality measurement and collective marketing among 15,000 wheat farmers in Ethiopia. Our results suggest that the intervention led to significant changes in farmers’ commercialization behaviors—namely, it prompted farmers to adopt behaviors geared toward assessing their wheat’s quality using easily implementable test-weight measures, assessing the accuracy of the equipment used by buyers in their kebeles (scales, in particular), and contacting more than one buyer before concluding a sale. The training also led to improvements in share of output sold, price received, and collective marketing, albeit with important limitations. First, farmers who measured their wheat quality received a higher price, but only if their wheat was of higher quality. Second, farmers who found that their wheat was of higher quality were more reluctant to aggregate their wheat (that is, sell their products through local cooperatives) than those who found that their wheat was of lower quality. Lastly, the training intervention led to better use of fertilizer in the following season. Our discovery that a short training intervention can significantly change farmers’ marketing and production behavior should encourage the development of further interventions aimed at enhancing farmers’ adoption of improved technologies and commercialization.

Author: Bernard, Tanguy
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 44

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Book Description
Health-related incentives to reward effort or commitment are commonplace in many professional contracts throughout the world. Typically absent from small-scale agriculture in poor countries, such incentives may help overcome both health issues for remote rural families and supply issues for firms. Using a randomized control design, we investigate the impact of adding a micronutrient-fortified product in contracts between a Senegalese dairy processing factory and its seminomadic milk suppliers. Findings show significant increases in frequency of delivery but only limited impacts on total milk delivered. These impacts are time sensitive and limited mostly to households where women are more in control of milk contracts.

Author: Ragasa, Catherine
Publisher: Intl Food Policy Res Inst
ISBN:
Category : Political Science
Languages : en
Pages : 54

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Book Description
The focus in this paper is on two relatively large maize-based contract farming (CF) schemes with fixed input packages (Masara and Akate) and a number of smaller and more flexible CF schemes in a remote region in Ghana (Upper West). Results show that these schemes led to improved technology adoption and yield increases. In addition, a subset of maize farmers with high yield improvements due to CF participation had high gross margins. However, on average, yields were not high enough to compensate for higher input requirements and cost of capital. On average, households harvest 29–30 bags (100 kg each), or 2.9–3.0 metric tons, of maize per hectare, and the required repayment for fertilizer, seed, herbicide, and materials provided under the average CF scheme is 21–25 bags (50 kg each) per acre, or 2.6–3.0 tons per hectare, which leaves almost none for home consumption or for sale. Despite higher yields, the costs to produce 1 ton of maize under CF schemes remain high on average—higher than on maize farms without CF schemes, more than twice that of several countries in Africa, and more than seven times higher than that of major maize-exporting countries (the United States, Brazil, and Argentina). Sustainability of these CF schemes will depend on, from the firms’ perspective, minimizing the costs to run and monitor them, and from the farmers’ perspective, developing and promoting much-improved varieties and technologies that may lead to a jump in yields and gross margins to compensate for the high cost of credit.