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Nina G. Jablonski - One of the best experts on this subject based on the ideXlab platform.

  • Technical note: comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation.
    American Journal of Physical Anthropology, 2013
    Co-Authors: Anna K. Swiatoniowski, Ellen E. Quillen, Mark D Shriver, Nina G. Jablonski
    Abstract:

    Prior to the introduction of reflectance spectrophotometry into anthropological field research during the 1950s, human skin color was most commonly classified by visual skin color matching using the von Luschan tiles, a set of 36 standardized, opaque glass tiles arranged in a chromatic scale. Our goal was to establish a Conversion Formula between the tile-based color matching method and modern reflectance spectrophotometry to make historical and contemporary data comparable. Skin pigmentation measurements were taken on the forehead, inner upper arms, and backs of the hands using both the tiles and a spectrophotometer on 246 participants showing a broad range of skin pigmentation. From these data, a second-order polynomial Conversion Formula was derived by jackknife analysis to estimate melanin index (M-index) based on tile values. This Conversion Formula provides a means for comparing modern data to von Luschan tile measurements recorded in historical reports. This is particularly important for populations now extinct, extirpated, or admixed for which tile-based measures of skin pigmentation are the only data available. Am J Phys Anthropol 151:325–330, 2013. © 2013 Wiley Periodicals, Inc.

  • Technical note: comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation.
    American journal of physical anthropology, 2013
    Co-Authors: Anna K. Swiatoniowski, Ellen E. Quillen, Mark D Shriver, Nina G. Jablonski
    Abstract:

    Prior to the introduction of reflectance spectrophotometry into anthropological field research during the 1950s, human skin color was most commonly classified by visual skin color matching using the von Luschan tiles, a set of 36 standardized, opaque glass tiles arranged in a chromatic scale. Our goal was to establish a Conversion Formula between the tile-based color matching method and modern reflectance spectrophotometry to make historical and contemporary data comparable. Skin pigmentation measurements were taken on the forehead, inner upper arms, and backs of the hands using both the tiles and a spectrophotometer on 246 participants showing a broad range of skin pigmentation. From these data, a second-order polynomial Conversion Formula was derived by jackknife analysis to estimate melanin index (M-index) based on tile values. This Conversion Formula provides a means for comparing modern data to von Luschan tile measurements recorded in historical reports. This is particularly important for populations now extinct, extirpated, or admixed for which tile-based measures of skin pigmentation are the only data available.

Anna K. Swiatoniowski - One of the best experts on this subject based on the ideXlab platform.

  • Technical note: comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation.
    American Journal of Physical Anthropology, 2013
    Co-Authors: Anna K. Swiatoniowski, Ellen E. Quillen, Mark D Shriver, Nina G. Jablonski
    Abstract:

    Prior to the introduction of reflectance spectrophotometry into anthropological field research during the 1950s, human skin color was most commonly classified by visual skin color matching using the von Luschan tiles, a set of 36 standardized, opaque glass tiles arranged in a chromatic scale. Our goal was to establish a Conversion Formula between the tile-based color matching method and modern reflectance spectrophotometry to make historical and contemporary data comparable. Skin pigmentation measurements were taken on the forehead, inner upper arms, and backs of the hands using both the tiles and a spectrophotometer on 246 participants showing a broad range of skin pigmentation. From these data, a second-order polynomial Conversion Formula was derived by jackknife analysis to estimate melanin index (M-index) based on tile values. This Conversion Formula provides a means for comparing modern data to von Luschan tile measurements recorded in historical reports. This is particularly important for populations now extinct, extirpated, or admixed for which tile-based measures of skin pigmentation are the only data available. Am J Phys Anthropol 151:325–330, 2013. © 2013 Wiley Periodicals, Inc.

  • Technical note: comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation.
    American journal of physical anthropology, 2013
    Co-Authors: Anna K. Swiatoniowski, Ellen E. Quillen, Mark D Shriver, Nina G. Jablonski
    Abstract:

    Prior to the introduction of reflectance spectrophotometry into anthropological field research during the 1950s, human skin color was most commonly classified by visual skin color matching using the von Luschan tiles, a set of 36 standardized, opaque glass tiles arranged in a chromatic scale. Our goal was to establish a Conversion Formula between the tile-based color matching method and modern reflectance spectrophotometry to make historical and contemporary data comparable. Skin pigmentation measurements were taken on the forehead, inner upper arms, and backs of the hands using both the tiles and a spectrophotometer on 246 participants showing a broad range of skin pigmentation. From these data, a second-order polynomial Conversion Formula was derived by jackknife analysis to estimate melanin index (M-index) based on tile values. This Conversion Formula provides a means for comparing modern data to von Luschan tile measurements recorded in historical reports. This is particularly important for populations now extinct, extirpated, or admixed for which tile-based measures of skin pigmentation are the only data available.

Ellen E. Quillen - One of the best experts on this subject based on the ideXlab platform.

  • Technical note: comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation.
    American Journal of Physical Anthropology, 2013
    Co-Authors: Anna K. Swiatoniowski, Ellen E. Quillen, Mark D Shriver, Nina G. Jablonski
    Abstract:

    Prior to the introduction of reflectance spectrophotometry into anthropological field research during the 1950s, human skin color was most commonly classified by visual skin color matching using the von Luschan tiles, a set of 36 standardized, opaque glass tiles arranged in a chromatic scale. Our goal was to establish a Conversion Formula between the tile-based color matching method and modern reflectance spectrophotometry to make historical and contemporary data comparable. Skin pigmentation measurements were taken on the forehead, inner upper arms, and backs of the hands using both the tiles and a spectrophotometer on 246 participants showing a broad range of skin pigmentation. From these data, a second-order polynomial Conversion Formula was derived by jackknife analysis to estimate melanin index (M-index) based on tile values. This Conversion Formula provides a means for comparing modern data to von Luschan tile measurements recorded in historical reports. This is particularly important for populations now extinct, extirpated, or admixed for which tile-based measures of skin pigmentation are the only data available. Am J Phys Anthropol 151:325–330, 2013. © 2013 Wiley Periodicals, Inc.

  • Technical note: comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation.
    American journal of physical anthropology, 2013
    Co-Authors: Anna K. Swiatoniowski, Ellen E. Quillen, Mark D Shriver, Nina G. Jablonski
    Abstract:

    Prior to the introduction of reflectance spectrophotometry into anthropological field research during the 1950s, human skin color was most commonly classified by visual skin color matching using the von Luschan tiles, a set of 36 standardized, opaque glass tiles arranged in a chromatic scale. Our goal was to establish a Conversion Formula between the tile-based color matching method and modern reflectance spectrophotometry to make historical and contemporary data comparable. Skin pigmentation measurements were taken on the forehead, inner upper arms, and backs of the hands using both the tiles and a spectrophotometer on 246 participants showing a broad range of skin pigmentation. From these data, a second-order polynomial Conversion Formula was derived by jackknife analysis to estimate melanin index (M-index) based on tile values. This Conversion Formula provides a means for comparing modern data to von Luschan tile measurements recorded in historical reports. This is particularly important for populations now extinct, extirpated, or admixed for which tile-based measures of skin pigmentation are the only data available.

Mark D Shriver - One of the best experts on this subject based on the ideXlab platform.

  • Technical note: comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation.
    American Journal of Physical Anthropology, 2013
    Co-Authors: Anna K. Swiatoniowski, Ellen E. Quillen, Mark D Shriver, Nina G. Jablonski
    Abstract:

    Prior to the introduction of reflectance spectrophotometry into anthropological field research during the 1950s, human skin color was most commonly classified by visual skin color matching using the von Luschan tiles, a set of 36 standardized, opaque glass tiles arranged in a chromatic scale. Our goal was to establish a Conversion Formula between the tile-based color matching method and modern reflectance spectrophotometry to make historical and contemporary data comparable. Skin pigmentation measurements were taken on the forehead, inner upper arms, and backs of the hands using both the tiles and a spectrophotometer on 246 participants showing a broad range of skin pigmentation. From these data, a second-order polynomial Conversion Formula was derived by jackknife analysis to estimate melanin index (M-index) based on tile values. This Conversion Formula provides a means for comparing modern data to von Luschan tile measurements recorded in historical reports. This is particularly important for populations now extinct, extirpated, or admixed for which tile-based measures of skin pigmentation are the only data available. Am J Phys Anthropol 151:325–330, 2013. © 2013 Wiley Periodicals, Inc.

  • Technical note: comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation.
    American journal of physical anthropology, 2013
    Co-Authors: Anna K. Swiatoniowski, Ellen E. Quillen, Mark D Shriver, Nina G. Jablonski
    Abstract:

    Prior to the introduction of reflectance spectrophotometry into anthropological field research during the 1950s, human skin color was most commonly classified by visual skin color matching using the von Luschan tiles, a set of 36 standardized, opaque glass tiles arranged in a chromatic scale. Our goal was to establish a Conversion Formula between the tile-based color matching method and modern reflectance spectrophotometry to make historical and contemporary data comparable. Skin pigmentation measurements were taken on the forehead, inner upper arms, and backs of the hands using both the tiles and a spectrophotometer on 246 participants showing a broad range of skin pigmentation. From these data, a second-order polynomial Conversion Formula was derived by jackknife analysis to estimate melanin index (M-index) based on tile values. This Conversion Formula provides a means for comparing modern data to von Luschan tile measurements recorded in historical reports. This is particularly important for populations now extinct, extirpated, or admixed for which tile-based measures of skin pigmentation are the only data available.

Klaus Dietz - One of the best experts on this subject based on the ideXlab platform.

  • A Conversion Formula for Comparing Pulse Oximeter Desaturation Rates Obtained with Different Averaging Times
    PloS one, 2014
    Co-Authors: Jan Vagedes, Cornelia Wiechers, Christian F. Poets, Anja Bialkowski, Klaus Dietz
    Abstract:

    Objective The number of desaturations determined in recordings of pulse oximeter saturation (SpO2) primarily depends on the time over which values are averaged. As the averaging time in pulse oximeters is not standardized, it varies considerably between centers. To make SpO2 data comparable, it is thus desirable to have a Formula that allows Conversion between desaturation rates obtained using different averaging times for various desaturation levels and minimal durations. Methods Oxygen saturation was measured for 170 hours in 12 preterm infants with a mean number of 65 desaturations

  • a Conversion Formula for comparing pulse oximeter desaturation rates obtained with different averaging times
    PLOS ONE, 2014
    Co-Authors: Jan Vagedes, Cornelia Wiechers, Christian F. Poets, Anja Bialkowski, Klaus Dietz
    Abstract:

    Objective The number of desaturations determined in recordings of pulse oximeter saturation (SpO2) primarily depends on the time over which values are averaged. As the averaging time in pulse oximeters is not standardized, it varies considerably between centers. To make SpO2 data comparable, it is thus desirable to have a Formula that allows Conversion between desaturation rates obtained using different averaging times for various desaturation levels and minimal durations. Methods Oxygen saturation was measured for 170 hours in 12 preterm infants with a mean number of 65 desaturations <90% per hour of arbitrary duration by using a pulse oximeter in a 2–4 s averaging mode. Using 7 different averaging times between 3 and 16 seconds, the raw red-to-infrared data were reprocessed to determine the number of desaturations (D). The whole procedure was carried out for 7 different minimal desaturation durations (≥1, ≥5, ≥10, ≥15, ≥20, ≥25, ≥30 s) below SpO2 threshold values of 80%, 85% or 90% to finally reach a Conversion Formula. The Formula was validated by splitting the infants into two groups of six children each and using one group each as a training set and the other one as a test set. Results Based on the linear relationship found between the logarithm of the desaturation rate and the logarithm of the averaging time, the Conversion Formula is: D2 = D1 (T2/T1)c, where D2 is the desaturation rate for the desired averaging time T2, and D1 is the desaturation rate for the original averaging time T1, with the exponent c depending on the desaturation threshold and the minimal desaturation duration. The median error when applying this Formula was 2.6%. Conclusion This Formula enables the Conversion of desaturation rates between different averaging times for various desaturation thresholds and minimal desaturation durations.

  • A Conversion Formula to Correct for Pulse Oximeter Desaturations Obtained with Different Averaging Times
    Pediatric Research, 2011
    Co-Authors: Jan Vagedes, T W Vine, Cornelia Wiechers, F A Hanel, Christian F. Poets, Klaus Dietz
    Abstract:

    A Conversion Formula to Correct for Pulse Oximeter Desaturations Obtained with Different Averaging Times