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Characteristics of studies analysing STAR data used in the data synthesis
| Folger, 1989 | Nye, 1992/994 | Finn, 2001 | Hanushek, 1999 | |
| Comparison | R | R + RA | R | R + RA |
| Size of R and RA classes used | 21‐28 | 22‐26 | 22‐26 | 22‐25 |
| Out‐of range classes | Excluded | Included | Not reported | Not reported |
| STAR trained teachers | Included | Excluded | Not reported | Not reported |
| Regression with covariate adjustment | No | No | Yes | No |
| Intention to treat/treatment as received | Not reported | Not reported | Not reported | Not reported |
