You can cite the webpage as you would any internet citation. The following papers are citations for lifetime and 12-month prevalence in the NCS-R, but do not have the breakdown by gender and age. Kessler, R.C., Berglund, P.A., Demler, O., Jin, R., Merikangas, K.R., Walters, E.E. (2005). Lifetime prevalence and age-of-onset distributions of DSM-IV disorders in the National Comorbidity Survey Replication (NCS-R). Archives of General Psychiatry, 62(6), 593-602. Kessler, R.C., Chiu, W.T., Demler, O., Merikangas, K. R., Walters, E.E. (2005). Prevalence, severity, and comorbidity of twelve-month DSM-IV disorders in the National Comorbidity Survey Replication (NCS-R). Archives of General Psychiatry, 62(6), 617-627.
