structure(list(study = c(1L, 1L, 2L, 2L, 3L, 3L, 3L, 4L, 4L, 
5L, 5L, 6L, 6L, 7L, 7L), treatment = c(1L, 3L, 1L, 2L, 1L, 2L, 
4L, 3L, 4L, 3L, 4L, 4L, 5L, 4L, 5L), mean = c(-1.22, -1.53, -0.7, 
-2.4, -0.3, -2.6, -1.2, -0.24, -0.59, -0.73, -0.18, -2.2, -2.5, 
-1.8, -2.1), std.err = c(0.504, 0.439, 0.282, 0.258, 0.505, 0.51, 
0.478, 0.265, 0.354, 0.335, 0.442, 0.197, 0.19, 0.2, 0.25)), .Names = c("study", 
"treatment", "mean", "std.err"), row.names = c(NA, -15L), class = "data.frame")
