Intention-to-treat analysis is an important aspect of randomized controlled trials of health care interventions. The concept is now widely accepted in theory, but not always implemented in practice. Failure to analyse by intention-to-treat can give misleading and indeed life-threatening interpretations. In some studies, a case is put for estimating the effect that would have been observed if all patients had received the allocated treatment. Situations where this is valid are rare, but an example is given of such an exceptional study. The relevance of the intention-to-treat concept is not always taken into account in qualitative research. Interviews with new mothers who delivered their babies at home in a hypothetical controlled trial of home versus hospital confinement would provide fascinating accounts of the pleasure of successful delivery at home. But by definition the interviews would exclude the hazard and drama of necessary transfers to hospital due to complications in late pregnancy and early labour. The intention-to-treat approach would avoid this bias.

There is a significant association between vitiligo and thyroid disease. Thyroglobulin antibodies are significantly associated with vitiligo, whether patients with psoriasis or a general practice population are taken as controls. Similarly complement-fixing antibodies are significantly associated with vitiligo as compared with psoriasis. There is no evidence that thyroid autoimmunity is associated positively or negatively with psoriasis. Alopecia areata, pernicious anaemia and diabetes mellitus are also significantly associated with vitiligo.

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Background: It is known that proteins associated with Alzheimer's disease (AD) pathogenesis are significantly reduced by 40 Hz entrainment in mice. If this were to translate to humans, verifying that such a light stimulus can induce a 40 Hz entrainment response in humans and harnessing insights from these case studies could be one step in the development of a multisensory device to prevent and treat AD. Objective: Verify the inducement of a 40 Hz response in the human brain by a 40 Hz light stimulus and obtain insights that could potentially aid in the development of a multisensory device for the prevention and treatment of AD. Methods: Electroencephalographic brain activity was recorded simultaneously with application of stimulus at different frequencies and intensities. Power spectral densities were analyzed. Results: Entrainment to visual stimuli occurred with the largest response at 40 Hz. The high intensity 40 Hz stimulus caused widespread entrainment. The number of electrodes demonstrating entrainment increased with increasing light intensity. Largest amplitudes for the high intensity 40 Hz stimulus were consistently found at the primary visual cortex. There was a harmonic effect at double the frequency for the 40 Hz stimulus. An eyes-open protocol caused more entrainment than an eyes-closed protocol. Conclusion: It was possible to induce widespread entrainment using a 40 Hz light stimulus in this sample cohort. Insights gleaned from these case studies could potentially aid in the development of a multisensory medical device to prevent and treat AD.

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MEDICAJLJOURNAL solution-for example, 0 5 ,ug./ml. It seems probable that the outstanding prophylactic effectiveness of silver nitrate compresses is due to the high concentration of silver ions present in the dressings for a short while after each replenishment of silver nitrate solution.The tests on Ps. aeruginosa showed that the lowest concentration of silver ions associated with bactericidal action was considerably higher than that associated with bacteriostasis. This difference can probably be ascribed in part to the shorter exposure of bacteria in the tests for bactericidal action; it is possible, too, that a higher concentration of silver ions is required for killing than for inhibition of the bacteria. REFERENCES Cason, J. S., Jackson, D. M., Lowbury, E. J. L., and Ricketts, C. R. (1966 British Medical_Journal, 1970, 2, 446-449 Summary: Forty-eight patients with anxiety states were treated with oxazepam (Serenid-D), which was administered in tablets of three different colours-red, yeliow, and green. Every patient received one week's treatment with each colour, according to a random programme. A latin square design was used to ensure complete balance between the colours and between the weeks. The patients' symptoms were categorized and then assessed by both weekly physicians' ratings and daily self-rating, which showed close agreement. Colour preference was shown on both these scales in that symptoms of anxiety were most improved with green, whereas depressive symptoms appeared to respond best to yellow. Such colour preferences, however, did not reach levels of statistical significance, except for phobias as rated on the physicians' assessment.The results indicate that colour may play a part in the response to a drug.