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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: Prev Med. 2016 Aug 8;91:144–151. doi: 10.1016/j.ypmed.2016.08.014

Table 1.

Characteristics of Study Participants in the Nurses’ Health Study in 2000 (n=21,728)a,b

Variable Mean (SD) or %
Age 71.4 (4.1)
Body Mass Index, kg/m2 26.1 (4.9)
Alternate Mediterranean diet score 4.5 (1.8)
Moderate to vigorous activity per week (hours) 1.6 (2.8)
Education level
 Registered nurse degree, % 72.5
 Bachelor degree, % 18.8
 Advanced degree, % 8.7
Self-reported race/ethnicity
 Non-Hispanic White, % 97.2
 Black, % 0.9
 Others, % 1.8
Social network (in quintiles)
 1st quintile (least social integration), % 19.6
 2nd quintile, % 13.5
 3rd quintile, % 17.9
 4th quintile, % 34.7
 5th quintile (most social integration), % 14.2
Subjective self-rated societal position
 High, % 14.0
 Medium-high, % 53.7
 Medium-low, % 30.6
 Low, % 1.7
Regular caregiving to children/grandchildren
 No, % 69.9
 Some, % 25.2
 High, % 4.8
Regular caregiving to ill relatives
 No, % 78.4
 Some, % 17.1
 High, % 4.6
Current smokers, % 6.2
Largest number of drinks in a single day
 None, % 41.1
 1–2 drinks, % 49.2
 ≥3, % 9.7
Comorbidity
 ≤1, % 91.9
 ≥2, % 8.1
Hours of actual sleep per day
 ≤6, % 25.8
 7–8, % 66.9
 9, % 6.2
 ≥10, % 1.2
Difficulty falling or staying asleep
 None of the time, % 34.5
 A little of the time, % 32.9
 Some of the time, % 29.0
 Most or all of the time, % 3.7
Total bodily pain
 None, % 18.3
 Very mild/mild, % 57.9
 Moderate, % 20.8
 Severe/very severe, % 3.1
Physical/functional limitation
 No, % 35.5
 Yes, % 64.5

Abbreviation: SD, standard deviation

a

Values are expressed as means (standard deviation) or percentages.

b

All variables were age-adjusted except for age variable