Table 1
The distribution of sample schools and students.
Source. Authors' survey.
Number of schools (1) Number of students in
sample schools (2)
Number of students with
hemoglobin test (3)
Percentage of
students (4)
Full sample 70 2686 1357 100
By County
Qingshui 10 561 269 20.9
Wushan 12 531 272 19.8
Zhangjia 10 288 143 10.7
Gangu 19 641 333 23.9
Qinan 19 665 337 24.8
By treatment
1. Chewable vitamin 20 757 381 28.2
2. Egg 20 833 426 31.0
3. Control 30 1096 550 40.8