Table 1.
Study sample characteristics, among participants with complete basic socio-demographics and cognitive dataa (20–59yo and 60–90yo), NHANES III phase 1 (1988–1991)
| 20–59yo | 60–90yo | |||||
|---|---|---|---|---|---|---|
| N | Mean or % | SE | N | Mean or % | SE | |
|
|
|
|||||
| Socio-demographic | ||||||
| Women, % | 2,438 | 51.0 | 1.5 | 57.6 | 1.2 | |
| Age, y | 2,438 | 36.9 | 0.3 | 3,382 | 70.3 | 0.2 |
| Race, % | 2,438 | 3,382 | ||||
| NH White | 78.0 | 2.4 | 86.3 | 1.8 | ||
| NH Black | 11.0 | 1.2 | 8.2 | 1.1 | ||
| Mexican-American | 5.2 | 0.7 | 2.1 | 0.4 | ||
| Other ethnicity | 5.8 | 1.3 | 3.3 | 0.9 | ||
| Married, % | 2,438 | 61.2 | 1.9 | 3,382 | 59.2 | 1.5 |
| Education, % | 2,438 | 3,336 | ||||
| <High School | 7.1 | 0.8 | 25.2 | 2.3 | ||
| High School | 49.1 | 1.9 | 47.1 | 1.4 | ||
| >High School | 43.8 | 2.2 | 27.7 | 2.1 | ||
| Poverty income ratio, % | 2,438 | 3,382 | ||||
| 0–100% | 11.0 | 1.0 | 10.6 | 1.1 | ||
| >100%–200% | 17.9 | 2.0 | 24.8 | 1.9 | ||
| >200% | 71.1 | 2.1 | 64.5 | 2.2 | ||
| Language of interview | 2,438 | 3,348 | ||||
| English | 95.8 | 0.9 | 98.3 | 0.3 | ||
| Spanish | 4.2 | 0.9 | 1.7 | 0.3 | ||
| Lifestyle and health-related | ||||||
| Cigarette smoking status | 2,438 | 3,382 | ||||
| Never | 43.3 | 1.7 | 43.8 | 1.3 | ||
| Former | 22.5 | 1.5 | 40.1 | 1.6 | ||
| Current | 34.2 | 1.7 | 16.1 | 0.9 | ||
| Self-rated health | 2,438 | 3,382 | ||||
| Excellent | 24.6 | 1.7 | 12.8 | 1.3 | ||
| Very good | 31.5 | 1.7 | 23.3 | 1.3 | ||
| Good | 31.8 | 1.6 | 34.7 | 1.6 | ||
| Fair | 10.8 | 1.3 | 21.1 | 1.6 | ||
| Poor | 1.7 | 0.4 | 7.8 | 0.6 | ||
| 1995-Healthy Eating Index, % | 2,399 | 3,382 | ||||
| Mean | 61.6 | 0.5 | 68.0 | 0.5 | ||
| Q1:poor quality diet | 6.8 | 0.7 | 3,382 | 4.3 | 0.4 | |
| Q5:better quality diet | 16.2 | 1.5 | 35.5 | 1.7 | ||
| Physical activity | 2,395 | 3,236 | ||||
| More active | 22.7 | 1.4 | 16.8 | 1.2 | ||
| About the same | 46.2 | 1.2 | 41.1 | 1.2 | ||
| Less active | 31.2 | 1.4 | 42.1 | 1.7 | ||
| Co-morbidity index, Mean | 2,412 | 1.10 | 0.04 | 3,369 | 2.82 | 0.07 |
| Body mass index, kg.m−2, Mean | 2,432 | 26.2 | 0.2 | 2,843 | 26.6 | 0.1 |
| H. pylori exposures | ||||||
| H. pylori IgG, % positive | 2,247 | 26.5 | 1.9 | 2,388 | 52.6 | 1.6 |
| H. pylori CagA IgG, % positive | 2,248 | 16.7 | 1.3 | 2,388 | 25.8 | 1.2 |
| Cognitive performance scores | ||||||
| SRT | 2,438 233.1 | 1.4 | __ | __ | __ | |
| SDS-L | 2,404 23.0 | 0.2 | __ | __ | __ | |
| SDS-E | 2,404 1.4 | 0.1 | __ | __ | __ | |
| SDL-TTC | 2,267 4.6 | 0.1 | __ | __ | __ | |
| SDL-TE | 2,335 4.5 | 0.2 | __ | __ | __ | |
| WR-CORR | __ | ____ | 3,109 | 5.50 | 0.03 | |
| WR-TRIALS | __ | ____ | 3,048 | 0.05 | 0.01 | |
| SR-CORR | __ | ____ | 2,569 | 4.09 | 0.04 | |
| MATH-INC | __ | ____ | 3,382 | 0.74 | 0.05 | |
| ORIENT-INC | __ | ____ | 2,922 | 1.85 | 0.01 | |
The largest available sample size per age group was used by selecting the most complete cognitive measure per age group.
Abbreviations: M=Median; NHANES=National Health and Nutrition Examination Surveys; R=Range; SE=Standard error; NH=Non-Hispanic; SRT=Simple reaction time ;SDS-L=Symbol Digits Substitution tests-Latencies; SDS-E=Symbol Digits Substitution tests-Errors; Serial Digits Learning-Trials to completion; SDL-TE=Serial Digits Learning-Total Errors; WR-CORR=Word Recall-Correct; WR-TRIALS=Word Recall-Number of Trials; ; SR-CORR=Story recall-correct; MATH-INC=Math test-Incorrect; ORIENT-INC=Orientation to time, incorrect items.