Figure 4.

Pre-test and post-test scores (± standard error) given by parents (MPROX) in blue and teachers (PBLIND) in green, dashed line. Data hypothesized under two different hypotheses: (A) no placebo effect, teachers see fewer symptoms altogether so that difference pre-post is low and (B) placebo effect, teachers see as many baseline symptoms as parents but do not see as much improvement. (C) Real data: evolution of parents' and teachers' scores between pre- and post-test on studies that satisfy Cortese et al.'s (1) inclusion criteria and that provide teachers and parents' scores on the same scale.