Ryoko Sato
Biographic Data
| ID | 3709868 |
|---|---|
| NAME | Ryoko Sato |
| GIVEN NAMES | Ryoko |
| FAMILY NAME | Sato |
| SIGNATURE | SATO R |
| AFFILIATIONS | Harvard University |
| ORCID | 0000-0001-7040-317X |
| VERIFIED | Yes |
| TOTAL WORKS | 16 |
| TOTAL CITATIONS | 5 |
| AUTHOR COUNT | 16 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2019 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 2 |
Cost-effectiveness of a simplified acute malnutrition program
Acute malnutrition (AM) causes large loss of life and disability in children in Africa. Researchers are testing innovative approaches to increase the efficiency of treatment programs This paper presents results of a cost-effectiveness analysis of one such program in the Democratic Republic of the Congo (DRC) based on a secondary analysis of a randomized controlled trial Optimizing Treatment for Acute Malnutrition (OptiMA), conducted in DRC in 201…
Trends of the second measles vaccine (MCV2) over time after its launch as part of routine immunization in Nigeria
Introduction: Nigeria has one of the highest measles burdens and the lowest vaccination coverage in the world. Geographical disparity in the coverage has also been persistent. Between 2019 and 2021, the Nigerian government introduced the second Measles vaccine (MCV2) into routine immunization (RI). This study evaluated the trends of the MCV2 coverage over time across geographical zones. Methods: The monthly data on the MCV2 coverage from District…
Estimating immunization coverage at the district level
Ethiopia has made significant progress in the last two decades in improving the availability and coverage of essential maternal and child health services including childhood immunizations. As Ethiopia keeps momentum towards achieving national immunization goals, methods must be developed to analyze routinely collected health facility data and generate localized coverage estimates. This study leverages the District Health Information Software (DHI…
Factors associated with knowledge and use of home pregnancy test kits in Uganda
Early detection of pregnancy status may help women initiate earlier antenatal care and healthy pregnancy behaviors, which could lead to healthier mothers and infants. Pregnancy tests are inexpensive and easy to use; meanwhile, little attention has been given to understanding women’s knowledge and use of home pregnancy tests, especially in developing countries. We analyze cross-sectional data collected from 1,008 women ages 18–35, living in Northe…
Joint distribution of child mortality and wealth across 30 sub-Saharan African countries over 2000-2019
Background: While reductions in child mortality have been observed across sub-Saharan African countries in the last 30 years, narrowing the gaps in under-five mortality across socioeconomic groups also requires an understanding of the multiple associations between health and welfare and socioeconomic drivers. We examined the probability density distributions in under-five mortality within countries and joint pathways of under-five mortality and w…
Estimated travel time and staffing constraints to accessing the Ethiopian health care system
Background: Despite large investments in the public health care system, disparities in health outcomes persist between lower- and upper-income individuals, as well as rural vs urban dwellers in Ethiopia. Evidence from Ethiopia and other low- and middle-income countries suggests that challenges in health care access may contribute to poverty in these settings. Methods: We employed a two-step floating catchment area to estimate variations in spatia…
Childhood exposure to armed conflict and nutritional health outcomes in Nigeria
Childhood exposure to armed conflict is associated with long-term malnutrition in children aged 36-59 months in Nigeria. Strategies that aim to end childhood malnutrition could target children exposed to armed conflicts
Cost analysis of an innovative eHealth program in Nigeria
Our study is one of the first to conduct a cost analysis of eHealth technology in Africa. The incremental cost of USD20.6 was within the range of other interventions that intended to increase vaccine uptake in low- and middle-income countries. The VDD program is a promising technology to substantially reduce vaccine stockout, leading to a reduction of over 55% at a reasonable cost, representing 26% of the total budget for routine immunization act…
Modeling the relative risk of incidence and mortality of select vaccine-preventable diseases by wealth group and geographic region in Ethiopia
Immunization is one of the most effective public health interventions, saving millions of lives every year. Ethiopia has seen gradual improvements in immunization coverage and access to child health care services; however, inequalities in child mortality across wealth quintiles and regions remain persistent. We model the relative distributional incidence and mortality of four vaccine-preventable diseases (VPDs) (rotavirus diarrhea, human papillom…
The relationships between adverse life events, depression, economic activities, and human capital investment in Nigeria
This paper examines the links between adverse events, depression, and decision-making in Nigeria. It investigates how events such as conflicts, shocks, and deaths of family members can affect short-term mental health, as well as longer-term decisions on economic activities and human capital investments. First, the findings show that exposure to conflict has the largest and strongest relationship with depression, associated with a 21-26 percentage…
Differential effect of conflicts on vaccination
The Boko Haram insurgency is one of the most devastating violent crises that Nigeria has encountered in recent years. This paper compares the relative effect of the Boko Haram insurgency, as compared to other conflict events, on vaccination uptake among Nigerian children. To evaluate the effect of conflict events on vaccination, the children's birth months and the months of armed conflict were matched. The data on vaccination uptake was from the …
Utilization patterns, outcomes and costs of a simplified acute malnutrition treatment programme in Burkina Faso
Access to treatment for acute malnutrition remains a challenge, in part due to the fragmentation of treatment programmes based on case severity. This paper evaluates utilization patterns, outcomes and associated costs for treating acute malnutrition cases among a cohort of children in Burkina Faso. This study is a secondary analysis of a proof-of-concept trial, called Optimizing treatment for acute Malnutrition (OptiMA), conducted in Burkina Faso…
Cash incentives for weight loss work only for males
When governments and healthcare providers offer people cash rewards for weight loss, an assumption is that cash rewards are versatile, working equally well for everyone – for example, for all genders. No research to date has tested for gender difference in response to financial incentives for weight loss. We show in an randomized controlled trial (RCT) ( n = 472) that cash incentives for weight loss only worked for males. The RCT consisted of a 3…
The distance-quality trade-off in women’s choice of family planning provider in North Eastern Tanzania
Introduction: Studies on the determinants of contraceptive use often consider distance to the nearest health facility offering contraception as a key explanatory variable. Women, however, may not seek contraception from the nearest facility, rather opting for a more distant facility with better quality services or to ensure greater privacy and anonymity. Methods: The dataset used include the name of facility where each women obtained contraceptio…
Effect of armed conflict on vaccination
Overall, armed conflicts had a devastating effect on the vaccination of young children who were born at the time of these conflicts in northeastern Nigeria. A reduced vaccination rate puts the vulnerable population in affected areas at risk of contracting vaccine-preventable diseases
Peer Effects on Vaccination Behavior
Understanding how and why social interactions influence people’s vaccination behavior is important for disease control. This paper conducts the first causal analysis of peer effects on vaccination behavior in developing countries. We created exogenous variations in peers’ vaccination behaviors by randomizing cash incentives for tetanus vaccine take-up among Nigerian women. Vaccine take-up among friends strongly increased women’s take-up. The peer…
Peer Effects on Vaccination Behavior
Understanding how and why social interactions influence people’s vaccination behavior is important for disease control. This paper conducts the first causal analysis of peer effects on vaccination behavior in developing countries. We created exogenous variations in peers’ vaccination behaviors by randomizing cash incentives for tetanus vaccine take-up among Nigerian women. Vaccine take-up among friends strongly increased women’s take-up. The peer…
Cash incentives for weight loss work only for males
When governments and healthcare providers offer people cash rewards for weight loss, an assumption is that cash rewards are versatile, working equally well for everyone – for example, for all genders. No research to date has tested for gender difference in response to financial incentives for weight loss. We show in an randomized controlled trial (RCT) ( n = 472) that cash incentives for weight loss only worked for males. The RCT consisted of a 3…
Effect of armed conflict on vaccination
Overall, armed conflicts had a devastating effect on the vaccination of young children who were born at the time of these conflicts in northeastern Nigeria. A reduced vaccination rate puts the vulnerable population in affected areas at risk of contracting vaccine-preventable diseases
Peer Effects on Vaccination Behavior
Understanding how and why social interactions influence people’s vaccination behavior is important for disease control. This paper conducts the first causal analysis of peer effects on vaccination behavior in developing countries. We created exogenous variations in peers’ vaccination behaviors by randomizing cash incentives for tetanus vaccine take-up among Nigerian women. Vaccine take-up among friends strongly increased women’s take-up. The peer…
The distance-quality trade-off in women’s choice of family planning provider in North Eastern Tanzania
Introduction: Studies on the determinants of contraceptive use often consider distance to the nearest health facility offering contraception as a key explanatory variable. Women, however, may not seek contraception from the nearest facility, rather opting for a more distant facility with better quality services or to ensure greater privacy and anonymity. Methods: The dataset used include the name of facility where each women obtained contraceptio…
Differential effect of conflicts on vaccination
The Boko Haram insurgency is one of the most devastating violent crises that Nigeria has encountered in recent years. This paper compares the relative effect of the Boko Haram insurgency, as compared to other conflict events, on vaccination uptake among Nigerian children. To evaluate the effect of conflict events on vaccination, the children's birth months and the months of armed conflict were matched. The data on vaccination uptake was from the …
Utilization patterns, outcomes and costs of a simplified acute malnutrition treatment programme in Burkina Faso
Access to treatment for acute malnutrition remains a challenge, in part due to the fragmentation of treatment programmes based on case severity. This paper evaluates utilization patterns, outcomes and associated costs for treating acute malnutrition cases among a cohort of children in Burkina Faso. This study is a secondary analysis of a proof-of-concept trial, called Optimizing treatment for acute Malnutrition (OptiMA), conducted in Burkina Faso…
Cash incentives for weight loss work only for males
When governments and healthcare providers offer people cash rewards for weight loss, an assumption is that cash rewards are versatile, working equally well for everyone – for example, for all genders. No research to date has tested for gender difference in response to financial incentives for weight loss. We show in an randomized controlled trial (RCT) ( n = 472) that cash incentives for weight loss only worked for males. The RCT consisted of a 3…
Modeling the relative risk of incidence and mortality of select vaccine-preventable diseases by wealth group and geographic region in Ethiopia
Immunization is one of the most effective public health interventions, saving millions of lives every year. Ethiopia has seen gradual improvements in immunization coverage and access to child health care services; however, inequalities in child mortality across wealth quintiles and regions remain persistent. We model the relative distributional incidence and mortality of four vaccine-preventable diseases (VPDs) (rotavirus diarrhea, human papillom…
The relationships between adverse life events, depression, economic activities, and human capital investment in Nigeria
This paper examines the links between adverse events, depression, and decision-making in Nigeria. It investigates how events such as conflicts, shocks, and deaths of family members can affect short-term mental health, as well as longer-term decisions on economic activities and human capital investments. First, the findings show that exposure to conflict has the largest and strongest relationship with depression, associated with a 21-26 percentage…
Factors associated with knowledge and use of home pregnancy test kits in Uganda
Early detection of pregnancy status may help women initiate earlier antenatal care and healthy pregnancy behaviors, which could lead to healthier mothers and infants. Pregnancy tests are inexpensive and easy to use; meanwhile, little attention has been given to understanding women’s knowledge and use of home pregnancy tests, especially in developing countries. We analyze cross-sectional data collected from 1,008 women ages 18–35, living in Northe…
Joint distribution of child mortality and wealth across 30 sub-Saharan African countries over 2000-2019
Background: While reductions in child mortality have been observed across sub-Saharan African countries in the last 30 years, narrowing the gaps in under-five mortality across socioeconomic groups also requires an understanding of the multiple associations between health and welfare and socioeconomic drivers. We examined the probability density distributions in under-five mortality within countries and joint pathways of under-five mortality and w…
Estimated travel time and staffing constraints to accessing the Ethiopian health care system
Background: Despite large investments in the public health care system, disparities in health outcomes persist between lower- and upper-income individuals, as well as rural vs urban dwellers in Ethiopia. Evidence from Ethiopia and other low- and middle-income countries suggests that challenges in health care access may contribute to poverty in these settings. Methods: We employed a two-step floating catchment area to estimate variations in spatia…
Childhood exposure to armed conflict and nutritional health outcomes in Nigeria
Childhood exposure to armed conflict is associated with long-term malnutrition in children aged 36-59 months in Nigeria. Strategies that aim to end childhood malnutrition could target children exposed to armed conflicts
Cost analysis of an innovative eHealth program in Nigeria
Our study is one of the first to conduct a cost analysis of eHealth technology in Africa. The incremental cost of USD20.6 was within the range of other interventions that intended to increase vaccine uptake in low- and middle-income countries. The VDD program is a promising technology to substantially reduce vaccine stockout, leading to a reduction of over 55% at a reasonable cost, representing 26% of the total budget for routine immunization act…
Trends of the second measles vaccine (MCV2) over time after its launch as part of routine immunization in Nigeria
Introduction: Nigeria has one of the highest measles burdens and the lowest vaccination coverage in the world. Geographical disparity in the coverage has also been persistent. Between 2019 and 2021, the Nigerian government introduced the second Measles vaccine (MCV2) into routine immunization (RI). This study evaluated the trends of the MCV2 coverage over time across geographical zones. Methods: The monthly data on the MCV2 coverage from District…
Estimating immunization coverage at the district level
Ethiopia has made significant progress in the last two decades in improving the availability and coverage of essential maternal and child health services including childhood immunizations. As Ethiopia keeps momentum towards achieving national immunization goals, methods must be developed to analyze routinely collected health facility data and generate localized coverage estimates. This study leverages the District Health Information Software (DHI…
Cost-effectiveness of a simplified acute malnutrition program
Acute malnutrition (AM) causes large loss of life and disability in children in Africa. Researchers are testing innovative approaches to increase the efficiency of treatment programs This paper presents results of a cost-effectiveness analysis of one such program in the Democratic Republic of the Congo (DRC) based on a secondary analysis of a randomized controlled trial Optimizing Treatment for Acute Malnutrition (OptiMA), conducted in DRC in 201…
Medicine (16 works) · Environmental health (11 works) · Demography (8 works) · Population (7 works) · Vaccination (7 works) · Economics (6 works) · Global Maternal and Child Health (6 works) · Immunology (6 works) · Business (5 works) · Political science (5 works)