GAD2 and post-traumatic stress disorder: After adjusting for weights, 453 (8%, 95% CI 5% to 13%) of GAD-2 (yes/no) negatives and 1076 (27%, 95% CI 20% to 35%) of GAD-2 (yes/no) positives met criteria for any SCID anxiety disorder (including PTSD and OCD), whereas 5110 (92%, 95% CI 87% to 95%) GAD-2 (yes/no) negatives and 2881 (73%, 95% CI 65% to 80%) GAD-2 (yes/no) positives had no anxiety disorders (see online supplementary files 5 and 7 for cross-tabulation and proportions).