PubMed · 6644431
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R Rosen. 1983. Stocking constriction injuries.. https://doi.org/10.1016/s0022-3476(83)80723-9
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For efficiently measuring ultraviolet transmission through clothing materials for a large number of samples, an automated measuring system with a broad-band method has been built and calibrated against a spectroradiometer based instrument. The apparatus can be used to test 60 samples in 25 min. A selection of clothing materials of known composition, weave, color and state have been tested, using the broad band method and the automated measuring system together with a solar ultraviolet simulator. Variations of about eleven times for different weave structure, about two times in the ultraviolet transmittance for different colors, and about 20 times for some stretched samples were observed. For wet conditions, an increment in ultraviolet transmittance for cotton and lycra materials and a decrement for polyester and polyester(65%)/cotton(35%) were also observed.
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Bowen's disease, squamous and basal cell carcinoma, and malignant melanoma occur more frequently on the lower leg of women compared with men, presumably because of increased solar ultraviolet radiation (UVR) exposure as a consequence of dress. While it is apparent from simple observation that stockings are transparent to light, systematic data on UV transmission through stockings are lacking. The purpose of this study was to measure the spectral transmission of UVR through a range of thickness and colours of plain-knit ladies stockings, and to use these data to calculate the sun protection factor (SPF). We found that SPFs increased from about 1.5 to 3.0 for black stockings ranging from 10 to 40 denier; there were statistically significant differences in SPFs with colour (higher for darker colours) and site (higher at the distal calf than at the proximal calf); and for every colour and denier of stocking tested, UVA and UVB were absorbed equally. We conclude that the most popular type of stocking (15 denier) provides an SPF of less than 2, and that women who require photoprotection to the legs be advised to wear trousers or at least a 40 denier stocking.