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Case-control study One type of epidemiological study. Two groups, the cases (those with the disease being studied) and the controls (a comparison group) are compared to each other. Often used to investigate comparatively rare diseases.
CCRG see Childhood Cancer Research Group
CENELEC European electrical standards organisation
Childhood Cancer Research Group A research group in Oxford University, currently performing and epidemiological study of power lines and cancer for the Department of Health
Circuit A set of wires along which current flows and returns. It is necessary to have a complete circuit for current to flow.
Circular polarisation The extreme case of elliptical polarisation, where the field traces out a circle
CNS Central Nervous System, the brain and spinal cord
Corona Breakdown of the air , eg on the surface of a high-voltage conductor, to produce air ions
CSF Cerebro-spinal fluid. A fluid surrounding the spinal cord
Cohort study One type of epidemiological study. A group of people (the cohort) are examined over time to see which of them develop the disease under study.
Confounder, confounding In epidemiology, where an association between the agent being investigated and the disease is not caused by the agent at all, but a different factor, the confounder, which happens to be associated with the agent being investigated.
CSTEE A Committee of the European Commission (Scientific Committee on Toxicity, Ecotoxicity and the Environment), now replaced by SCENIHR.
Current is the flow of electricity. A voltage will always try to drive a current. The size current that is driven depends on the resistance of the circuit.