Assessment integrity and blinding success
To examine the inter-evaluator reliability of GRID-HAMD, 86 out of 406 (21.18%) randomly selected assessments were used. The single-measure inter-rater intraclass correlation coefficient (Model 2.1) between two evaluators was 0.96 (95% CI 0.94–0.98) for the total GRID-HAMD score. The intraclass correlation coefficient at the item level of GRID-HAMD (The true treatment assignment was accurately assumed in 64 out of 98 cases at 10 weeks (65.3% correct, χ