1. Haynes Birmingham for the period 1940-9, based upon accurately ascertained data.2 (The population was then almost entirely Caucasian.) The variation between years;Knox, Armstrong, and
2. The incidence of congenital pyloric stenosis related to birth rank and maternal age;McKeown, T.; MacMahon, B.; Record, R.G.;Annals ofEugenics,1951
3. Accuracy of hospital activity analysis data in have been no substantial changes in coding or data handling practice during the period of this study, and no changes in regional boundaries. We were unable to find any procedural changes between 1974 and 1980 that could explain an increase in incidence of approximately 60%. Compared with other diagnostic codings, IHPS is unambiguous and in surgically treated cases is backed by a coding of estimating the incidence of proximal femoral fracture;Rees, J.L.;Br Med J,1982
4. Accuracy of hospital activity analysis operation codes;Whates, P.D.; Birzgalis, A.R.; Irving, M.;Br Med J,1982
5. Congenital pyloric stenosis: an investigation of 578 cases;MacMahon, B.; Record, R.G.; McKeown, T.;Br J Soc Med,1951