|  | Intervention | Control |  | ||
---|---|---|---|---|---|---|
Trials | No. of students | No. of absences (No. of students) | Absenteeism risk | No. of absences (No. of students) | Absenteeism risk | Percent Relative Effect (95% CI)* |
Hammond et al. 31 | 6080 | 7441.5 (3075) | 2.42 | 9066 (3005) | 3.02 | 20 (19, 21) |
Guinan et al. 10 | 290 | 140 (145) | 0.97 | 277 (145) | 1.91 | 49 (42, 56) |