2. PROGRESS‐Plus equity checklist of included studies.
| Study ID | Place | Race/ethnicity | Occupation | Gender | Religion, culture, education | Socioeconomic status | Social capital | Others: (disability, age, sexual orientation) | Overall PROGRESS‐Plus |
| Candelaria 2005 | Philippines (low‐middle income) | Filipinos | Children | Males and females | Not available | High malnutrition prevalence‐indicates low‐income population groups | Not available | Vitamin A deficient (< 0.70 μmol/L) in 20% children 4‐7 years of age | This study recruited vitamin A‐deficient children from Zambales and Batangas province, where vitamin A deficiency was of public health importance in a low‐middle income country, Philippines |
| Vinod Kumar 2014 (C) | Kariapatty block, Tamil Nadu, India (low‐middle income) | Indian | Children | Males and females | Not available | Low‐income group (USD 40/month) | Not available | 5‐15 years | This study recruited children aged 5‐15 years from a village where agriculture is the main occupation from a low‐middle income country, India |
| Lopez‐Teros 2013 | Mexico (upper‐middle income) | Mexican | Preschool children | Males and females | Not available | Low socioeconomic community | Not available | Preschool children aged 3‐6 years | Preschool children (3‐6 years old) from low socioeconomic areas with mid to moderate VAD from a upper‐middle income country, Mexico |
| Rahman 2015 (C) | Bangladesh (low‐middle income) | Not available | Children | Males and females | Not available | Rural community (no details) | Not available | 6‐15 years | Children aged 6‐15 years from a rural community in a low‐middle income country, Bangladesh |
| Solon 1996 | Philippines (low‐middle income) | Filipinos | Children | Males and females | Not available | Rural population (no details) | Not available | 3‐6 years | Children aged 3‐6 years, from Silang village, which had low exposure to vitamin A supplementation programmes. Low‐middle income country, Philippines |
| Solon 2000 | Philippines (low‐middle income) | Flipino | Children | Males and females | Not available | Not available | Not available | 6‐13 years | Children 6‐13 years old from rural schools in Batangas exhibiting low serum retinol concentrations from a low middle‐income country, Philippines |
| Trinidad 2015 | Philippines (low‐middle income) | Flipino | Children | Males and females | Not available | Not available | Not available | 6‐year‐old children | 6‐year‐old children from low‐middle income country, Philippines |
| Vinod Kumar 2009a (C) | Chennai, India (low‐middle income) | Indian | Children | Males and females | Not available | Low socioeconomic status (< USD 50/month) | Not available | 5‐18 years old school children | Residential schoolchildren 5‐18 year old from a low‐middle income country, India |
| Wang 2017 (C) | China (upper‐middle income) | Chinese | Children | Males and females | Not available | Not available | Not available | 12‐14 years school children | School children 12‐14 years old from upper‐middle income country, China |
| Winichagoon 2006 | Thailand (upper‐middle income) | Not available | Schoolchildren | Males and females | Not available | Low socioeconomic status (annual income USD 730) | Not available | 5.5‐13.4 years | Rural children 5‐13.4 years old from sub districts of Trakan‐Phutphon of low socioeconomic status, 89% farming as main occupation from a upper‐middle income country, Thailand |
VAD: vitamin A deficiency.
USD: United States dollars (official currency of the United States of America).