PREFACE<br >I CHIATRIC DISORDER is certainly one of the major human problems of<br > time， perhaps of all time (It has always intrigued me that Cain slgv Abel<br >~， early in Genesis--Chapter 4， ve~e 8.) "lhe classic epidemio]ogical expres-<br >i of the key problems in social Dychiatry is more precise: Who has how much<br >ehlatrle disorder and why? In lerms of magnitude， the tentative answer to that<br >，stion is indeed that the population at risk to mental impairmen~ is large.<br >r~ classic examples will suffice<br > In Sweden， a clinical psychiatric survey of a "normal" population by Essen-<br >，ller found the following:<br > ~oh~hl， 1 24<br > The Midtown study initialed by Rcnnie. Stoic， et alz su~cyed a sample of<br >60 adults {ages twenty to filt}~nine) and estimated the following o~erall<br >Ills:<br > ME~I~HE~LT.~T NC<br > W~lt<br > Mtla S~，pt ~6<br > Moa~，，t~ s.，*， z2<br > 2~<br > s*，，，. 7<br > In a summary overview of Leighton s findings flora the Stilling Comity<br >dy，a tile following table is an e，ample of tile n，aguitude of the epidemiology<br >!syclllatric disorder<br >