Major central nervous system malformations in South Wales. I. Incidence, local variations and geographical factors.

Abstract

This investigation was centred on the agricultural Vale of Glamorgan and the mining valleys of Glamorgan and Monmouthshire (Fig. It included the whole of Glamorgan with the exception of the West Glamorgan division and the towns of Swansea Neath, Barry, and Cardiff (together with Penarth and the parishes of Whitchurch, Lisvane, Llanederyn, and Llanfedw in the Cardiff Rural District). In Monmouthshire all the mining valleys were included but not Cwmbran, Newport, all of Magor and St. Mellons except Rogerstone, and the agricultural eastern part of the county. The area was divided along the local government administrative boundaries into nine divisions in Glamorgan and three in Monmouthshire. These were largely industrial except for the whole of Glamorgan South-East, half of Pontypridd, and much of mid-Glamorgan which comprise the Vale of Glamorgan.