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Nurses Health Study I

The Nurses Health Study (NHS) questionnaire had the following questions involving chicken skin.

When you eat chicken, how often is it cooked with the skin on?

  • always
  • most of the time
  • sometimes
  • never

How often do you eat the skin?

  • always
  • most of the time
  • sometimes
  • never

The same calculations were applied to NHS as the Health Professionals Follow-up Study (HPFS). In order to account for the four answers, the following percentages were applied:

  • Always (100%)
  • Most of the time (75%)
  • Sometimes (50%)
  • Never (0%)

The following table illustrates the number of different combinations possible.

Percentage used in calculation Cook with skin Eat skin
100% cook w/skin and eat w/skin Always Always
75% cook w/skin and eat w/skin
25% cook w/skin and eat w/o skin
Always Most
50% cook w/skin and eat w/skin
50% cook w/skin and eat w/o skin
Always Sometimes
100% cook w/skin and eat w/o skin Always Never
25% cooked w/o skin
75% cooked w/skin and eat w/skin
Most Always
25% cooked w/o skin,
56% cooked w/ skin and eat w/skin
19% cooked with skin and eat w/o skin
Most Most
25% cooked w/o skin
37.5% cooked w/skin and eat w/skin
37.5% cooked with skin and eat w/o skin
Most Sometimes
25% cooked w/o skin
75% cooked w/skin and eat w/o skin
Most Never
50% cooked w/o skin
50% cooked w/skin and eat w/skin
Sometimes Always
50% cooked w/o skin
37.5% cooked w/skin and eat w/skin
12.5% cooked with skin and eat w/o skin
Sometimes Most
50% cooked w/o skin
25% cooked w/skin and eat w/skin
25% cooked with skin and eat w/o skin
Sometimes Sometimes
50% cooked w/o skin
50% cooked with skin and eat w/o skin
Sometimes Never
100% cooked w/o skin Never Never

A complete listing of the values is available.


For more information:

Kana Wu, MD, PhD
Harvard School of Public Health
Department of Nutrition
665 Huntington Avenue
Boston, MA 02115
Tel. 617-432-1842
Fax. 617-432-2435
e-mail:kana.wu@channing.harvard.edu