Table 1 Description of surveys and datasets
(1) | (2) | (3) | (4) | (5) | (6) |
|---|---|---|---|---|---|
Project number | Province | Year | Sample size | Age | Primary outcome variables |
1 | Shaanxi | 2008 | 4,055 | 9–14 | Standardized math test score, Math course grades given by teachers, Mental Health Test, Hemoglobin |
2 | Shaanxi | 2009 | 6,013 | 9–13 | Standardized math test score, Math course grades given by teachers, Mental Health Test, Self-esteem, Self-efficacy, Hemoglobin |
3 | Ningxia, Qinghai | 2009 | 15,169 | 9–14 | Standardized math test score, Math course grades given by teachers, Mental Health Test, Hemoglobin |
4 | Gansu, Qinghai, Shaanxi | 2011 | 32,915 | 9–14 | Standardized math test score, Math course grades given by teachers, Standardized Chinese test score, Chinese course Grades given by teachers, Hemoglobin |
5 | Ningxia | 2011 | 1,800 | 11 | Standardized math test score, Math course grades given by teachers, Mental Health Test, Self-esteem, Hemoglobin |
6 | Gansu | 2010 | 5,306 | 9–14 | Standardized math test score, Math course grades given by teachers, Mental Health Test, Self-esteem, Self-efficacy, Hemoglobin |
7 | Guizhou | 2013 | 4,307 | 9–11 | WAZ, HAZ, STH, Standardized math test score, Math course grades given by teachers, Working memory, Processing speed, Hemoglobin |