Current data on the exploration and the evaluation of clinical pain]

Pain is a complex, multidimensional and multifactorial neuropsychological phenomenon with sensory-discriminative, affective, cognitive and behavioral components. Issues on pain assessment are related to the objective evaluation of a subjective phenomenon. Different levels of evaluation are to be considered. Some methods like visual analogue scale, numerical scale and verbal permit a global pain estimation. The aim of other methods like the McGill Pain Questionnaire is a quantitative and qualitative evaluation of the sensory and affective pain components. The measure of objective behavioral changes is an interesting approach, but at the present time there is no valid, simple and commonly used method. There is also a need for methods permitting a better exploration of a pain, and in particular a selective evaluation of organic and functional factors. The limits of psychological factors evaluation are reported.     

Organic-solvent water pollution and low birth weight in Michigan.

This pilot study explored the association between a measure of water pollution caused by benzene or chlorinated solvents and the incidence of low birth weights for white residents of Michigan counties. A positive relationship between water pollution by these contaminants and the per cent of low-weight births (less than 2,500 grams, or about 5.5 pounds) resulted despite controls for the incidence of teenaged childbearing, infrequent prenatal care, and mean household income from wages or salaries. Water pollution showed an association with the incidence of low birth weight that was as strong as that between low birth weight and low prenatal care. While correlation cannot prove causation, the finding suggests that impure water may impair fetal growth in Michigan.