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Research Article
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Korean Journal of Community Nutrition 2020;25(1):48-60.
DOI: https://doi.org/10.5720/kjcn.2020.25.1.48
Published online: January 20, 2020
1)Department of Food and Nutrition, College of Human Ecology, Seoul National University, Seoul, Korea, Student
2)Department of Food and Nutrition, Chung-Ang University, Gyeonggi-do, Korea, Professor
3)Department of Food and Nutrition, College of Human Ecology, Seoul National University, Seoul, Korea, Professor
4)The Research Institute of Human Ecology, Seoul National University, Seoul, Korea, Professor
- †Corresponding author Jung Eun Lee Department of Food and Nutrition, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul 08226, Korea Tel: (02) 880-6834 Fax: (02) 884-0305 E-mail: jungelee@snu.ac.kr
• Received: December 6, 2019 • Revised: February 13, 2020 • Accepted: February 14, 2020
Copyright © 2020 Journal of the Korean Society of Community Nutrition
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract
-
Objectives
- Most cohort studies used food frequency questionnaires (FFQ) to evaluate coffee consumption as it assesses habitual dietary patterns, whereas some studies have used the 24-hour recalls (24HR) as it elicits in-depth description of foods and the amount eaten. The aim of this study was to compare FFQs and 24HR to assess the consumption of various types of coffee
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Methods
- We included 25,904 participants aged 40 years or older from the Health Examinees (HEXA) Study of the Korean Genome and Epidemiologic Study (KoGES). Each participant completed one FFQ and one-day (n=11,280) or two-day 24HR (n=14,624). We classified coffee types into: black coffee, coffee with sugar and cream, and coffee with sugar alone or cream alone. We compared the proportions of nondrinkers, black coffee, and coffee with sugar and cream through FFQ and 24HR.
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Results
- Among those who completed one FFQ and one-day 24HR, 39.4% of “nondrinkers” on one-day 24HR reported that they did not drink coffee on their FFQs. Whereas among those who complete two-day 24HR, 71.2% of “nondrinkers” on two-day 24HR said that they did not drink coffee on their FFQs. Among those who completed one FFQ and one-day 24HR, 58.3% marked “black coffee” on one-day 24HR said that they drank black coffee on their FFQs. Among those who complete two-day 24HR, 58.8% marked “black coffee” on two-day 24HR said that they drank black coffee on their FFQs. The kappa coefficients and percent agreements were 0.4 and 59.6%, respectively, for the comparison of coffee intake between FFQ and one-day 24HR, and 0.6 and 72.8%, respectively, for the comparison of coffee intake between FFQ and two-day 24HR.
-
Conclusions
- We found discrepancies between FFQs and 24HR in the types of coffee consumed. Such limitations should be considered when using the 24HR data to examine the effect of coffee consumption on disease development.
Fig. 1.Difference in proportions of types of coffee consumed by dietary assessment instrument: FFQ or one-day 24 HR Abbreviations: FFQ, food frequency questionnaire; 24 HR, 24-hour recall
Fig. 2.Difference in proportions of types of coffee consumed by dietary assessment instrument: FFQ or two-day 24 HR Abbreviations: FFQ, food frequency questionnaire; 24 HR, 24-hour recall
Table 1.General characteristics of the study population according to the responses to dietary assessment instruments
Table 2.General characteristics of the study population according to the type of coffee consumed by one-day 24-hour recall
Table 3.General characteristics of the study population according to the type of coffee consumed by two-day 24-hour recall
n (%) or Mean ± SD 1) P-value was evaluated by ANOVA for continuous variables and by the chi-square test for categorical variables P < 0.05. 2) Participants either only consumed one type of coffee or consumed a combination of different types of coffee (represented as combinations of four types of coffee) from 24 HR. 3) A few participants did not provide information. 4) Abbreviations: FFQ, food frequency questionnaire; BMI, body mass index
Table 4.General characteristics of the study population according to the type of coffee consumed from food frequency questionnaire
Table 5.Agreement of types of coffee between food frequency questionnaire and one-day 24-hour recall
n (%) 1) Exact agreement of types of coffee between FFQs and one-day 24 HR 2) Cohen's kappa coefficient 5×5; Agreement between nondrinkers only (from one-day 24 HR) and nondrinkers only (from FFQ), black coffee only (from one-day 24 HR) and black coffee only (from FFQ), coffee with sugar only (from one-day 24 HR) and coffee with sugar (from FFQ), coffee with cream only (from one-day 24 HR) and coffee with cream only (from FFQ), and coffee with sugar and cream or 3-in-2 coffee only (from one-day 24HR) and coffee with sugar and cream (from FFQ). 3) Abbreviations: FFQ, food frequency questionnaire; 24 HR, 24-hour recall
Table 6.Agreement of types of coffee between food frequency questionnaire and two-day 24-hour recall
n (%) 1) Exact agreement of types of coffee between FFQs and two-day 24 HR 2) Cohen's kappa coefficient 5x5; Agreement between nondrinkers only (from one-day 24 HR) and nondrinkers only (from FFQ), black coffee only (from one-day 24 HR) and black coffee only (from FFQ), coffee with sugar only (from one-day 24 HR) and coffee with sugar (from FFQ), coffee with cream only (from one-day 24 HR) and coffee with cream only (from FFQ), and coffee with sugar and cream or 3-in-2 coffee only (from one-day 24HR) and coffee with sugar and cream (from FFQ). 3) Abbreviations: FFQ, food frequency questionnaire; 24 HR, 24-hour recall
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XML DownloadComparison of 24-hour Recalls with a Food Frequency Questionnaire in Assessing Coffee Consumption: The Health Examinees (HEXA) Study
Fig. 1. Difference in proportions of types of coffee consumed by dietary assessment instrument: FFQ or one-day 24 HR Abbreviations: FFQ, food frequency questionnaire; 24 HR, 24-hour recall
Fig. 2. Difference in proportions of types of coffee consumed by dietary assessment instrument: FFQ or two-day 24 HR Abbreviations: FFQ, food frequency questionnaire; 24 HR, 24-hour recall
Fig. 1.
Fig. 2.
Comparison of 24-hour Recalls with a Food Frequency Questionnaire in Assessing Coffee Consumption: The Health Examinees (HEXA) Study
General characteristics of the study population according to the responses to dietary assessment instruments
| Variables | Subject with FFQ4) and one-day 24HR1),4) (n=11,280) S | Subject with FFQ and two-day 24HR2) (n=14,624) |
|---|---|---|
| Age (years old) | 52.8 ± 998.1 | 53.5 ± 998.2 |
| Sex | ||
| Men | 3,886 (34.5) | 4,571 (31.3) |
| Women | 7,394 (65.5) | 10,053 (68.7) |
| Education level3) | ||
| Under middle school | 1,315 (11.8) | 1,745 (12.1) |
| High school | 5,850 (52.7) | 7,921 (55.1) |
| College or more | 3,941 (35.5) | 4,723 (32.8) |
| BMI3),4) (kg/m2) | ||
| < 18.5 | 262 (92.3) | 308 (92.1) |
| 18.5∼ < 23 | 4,514 (40.0) | 5,808 (39.7) |
| 23∼ < 25 | 2,957 (26.2) | 4,011 (27.4) |
| ≥ 25 | 3,546 (31.4) | 4,496 (30.8) |
| Smoking status | ||
| Never | 7,978 (70.7) | 10,835 (74.1) |
| Former | 1,724 (15.3) | 2,112 (14.5) |
| Current | 1,578 (14.0) | 1,673 (11.4) |
| Alcohol drinking | ||
| Never | 5,647 (50.0) | 7,780 (53.2) |
| Former | 368 (93.3) | 497 (93.4) |
| Current | 5,265 (46.7) | 6,343 (43.4) |
| Regular exercise | ||
| No | 5,558 (49.3) | 6,851 (46.9) |
| Yes | 5,722 (50.7) | 7,769 (53.1) |
| Dietary intake from FFQ3) | ||
| Total energy (kcal/d) | 1,706.1 ± 539.0 | 1,717.5 ± 546.3 |
| Carbohydrate (% energy) | 70.9 ± 997.2 | 71.2 ±99 7.1 |
| Protein (% energy) | 13.5 ± 992.6 | 13.4 ± 992.5 |
| Fat (% energy) | 14.6 ± 995.6 | 14.4 ±99 5.6 |
n (%) or Mean ± SD 1) Participants completed one-day 24HR and FFQ. 2) Participants completed two-day 24HR and FFQ. 3) A few participants did not provide information. 4) Abbreviations: FFQ, food frequency questionnaire; 24HR, 24-hour recall; BMI, body mass index
General characteristics of the study population according to the type of coffee consumed by one-day 24-hour recall
| Variables | Types of coffee | P-value1) | |||||
|---|---|---|---|---|---|---|---|
| Nondrinkers (n=4,998) | Black coffee only2) (n=1,870) | Coffee with sugar only2) (n=501) | Coffee with cream only2) (n=30) | Coffee with sugar and cream or 3-in-1 coffee only2) (n=3,551) C | Combinations of four types of coffee2) (n=330) | ||
| Age (years old) | 53.5 ± 998.1 | 51.6 ±99 8.1 | 1 54.6 ± 997.9 | 53.7 ±99 8.4 | 52.5 ± 998.1 | 50.1 ± 997.5 | < .0001 |
| Sex | |||||||
| Men | 1,718 (34.4) | 536 (28.7) | 142 (28.3) | 8 (26.7) | 1,389 (39.1) | 93 (28.2) | < .0001 |
| Women | 3,280 (65.6) | 1,334 (71.3) | 359 (71.7) | 22 (73.3) | 2,162 (60.9) | 237 (71.8) | |
| Education level3) | |||||||
| Under middle school | 674 (13.7) | 147 (8.0) | 78 (15.9) | 1 (83.5) | 388 (11.1) | 27 (88.3) | < .0001 |
| High school | 2,593 (52.8) | 861 (46.5) | 296 (60.3) | 11 (37.9) | 1,950 (55.7) | 139 (42.6) | |
| College or more | 1,643 (33.5) | 842 (45.5) | 117 (23.8) | 17 (58.6) | 1,162 (33.2) | 160 (49.1) | |
| BMI3),4) (kg/m2) | |||||||
| < 18.5 | 131 (82.6) | 38 (82.0) | 10 (82.0) | 3 (10.0) | 73 (82.1) | 8 (82.4) | 0.0091 |
| 18.5∼ < 23 | 2,021 (40.4) | 785 (42.0) | 178 (35.5) | 13 (43.3) | 1,370 (38.6) | 147 (44.4) | |
| 23∼ < 25 | 1,300 (26.0) | 463 (24.8) | 148 (29.5) | 9 (30.0) | 949 (26.7) | 88 (26.8) | |
| ≥ 25 | 1,546 (30.9) | 584 (31.2) | 165 (33.0) | 5 (16.7) | 1,159 (32.6) | 87 (26.4) | |
| Smoking status | |||||||
| Never | 3,614 (72.3) | 1,366 (73.0) | 367 (73.3) | 21 (70.0) | 2,371 (66.8) | 239 (72.4) | < .0001 |
| Former | 757 (15.1) | 273 (14.6) | 62 (12.4) | 5 (16.7) | 573 (16.1) | 54 (16.4) | |
| Current | 627 (12.6) | 231 (12.4) | 72 (14.3) | 4 (13.3) | 607 (17.1) | 37 (11.2) | |
| Alcohol drinking | |||||||
| Never | 2,666 (53.3) | 896 (47.9) | 246 (49.1) | 14 (46.7) | 1,658 (46.7) | 167 (50.6) | < .0001 |
| Former | 171 (83.5) | 59 (83.2) | 16 (83.2) | 2 (86.6) | 112 (83.2) | 8 (82.4) | |
| Current | 2,161 (43.2) | 915 (48.9) | 239 (47.7) | 14 (46.7) | 1,781 (50.1) | 155 (47.0) | |
| Regular exercise | |||||||
| No | 2,499 (50.0) | 874 (46.7) | 234 (46.7) | 13 (43.3) | 1,789 (50.4) | 149 (45.2) | 0.0408 |
| Yes | 2,499 (50.0) | 996 (53.3) | 267 (53.3) | 17 (56.7) | 1,762 (49.6) | 181 (54.9) | |
| Dietary intake from FFQ 3),4) | |||||||
| Total energy (kcal/d) | 1,680.7 ± 540.1 1 | 1,737.2 ± 554.4 | 4 1,647.6 ± 491.1 1 | ,698.5 ± 485.4 | 1,735.2 ± 538.7 | 1,690.4 ± 483.4 | < .0001 |
| Carbohydrate (% energy) | 71.2 ± 997.3 | 69.8 ± 997.4 | 4 72.0 ± 996.9 | 69.8 ± 998.5 | 70.9 ± 996.8 | 70.3 ±99 6.8 | < .0001 |
| Protein (% energy) | 13.5 ± 992.7 | 13.9 ± 992.6 | 6 13.5 ± 992.4 | 14.1 ± 993.0 | 13.2 ± 992.4 | 13.4 ± 992.3 | < .0001 |
| Fat (% energy) | 14.1 ± 995.7 | 15.4 ± 995.8 | 8 13.7 ± 995.5 | 15.3 ± 996.4 | 14.9 ± 995.3 | 15.4 ± 995.5 | < .0001 |
General characteristics of the study population according to the type of coffee consumed by two-day 24-hour recall
| Variables | Types of coffee | P-value1) | |||||
|---|---|---|---|---|---|---|---|
| Nondrinkers (n=3,497) | Black coffee only2) (n=2,715) | Coffee with sugar only2) (n=602) | Coffee with cream only2) (n=29) | Coffee with sugar and cream or 3-in-1 coffee only2) (n=4,701) C | Combinations of four types of coffee2) (n=3,080) | ||
| Age (years old) | 55.7 ± 888.1 | 51.8 ± 887.7 | 54.5 ± 887.7 | 54.0 ± 887.6 | 53.5 ±88 8.2 | 52.2 ± 888.1 | < .0001 |
| Sex | |||||||
| Men | 940 (26.9) | 721 (26.6) | 150 (24.9) | 7 (24.1) | 1,829 (38.9) | 924 (30.0) | < .0001 |
| Women | 2,557 (73.1) | 1,994 (73.4) | 452 (75.1) | 22 (75.9) | 2,872 (61.1) | 2,156 (70.0) | |
| Education level3) | |||||||
| Under middle school | 582 (17.0) | 197 (87.3) | 93 (15.7) | 1 (83.6) | 597 (12.9) | 275 (89.0) | < .0001 |
| High school | 1,949 (57.1) | 1,307 (48.8) | 377 (63.6) | 12 (42.9) | 2,688 (58.1) | 1,588 (52.2) | |
| College or more | 885 (25.9) | 1,177 (43.9) | 123 (20.7) | 15 (53.5) | 1,345 (29.0) | 1,178 (38.7) | |
| BMI3),4) (kg/m2) | |||||||
| < 18.5 | 105 (83.0) | 50 (81.8) | 7 (81.2) | 1 (83.5) | 83 (81.8) | 62 (82.0) | < .0001 |
| 18.5∼ < 23 | 1,522 (43.5) | 1,100 (40.5) | 209 (34.7) | 11 (37.9) | 1,811 (38.5) | 1,155 (37.5) | |
| 23∼ < 25 | 946 (27.1) | 714 (26.3) | 172 (28.6) | 7 (24.1) | 1,277 (27.2) | 895 (29.1) | |
| ≥ 25 | 923 (26.4) | 851 (31.4) | 214 (35.5) | 10 (34.5) | 1,530 (32.6) | 968 (31.4) | |
| Smoking status | |||||||
| Never | 2,837 (81.1) | 2,079 (76.6) | 462 (76.7) | 21 (72.4) | 3,158 (67.2) | 2,278 (74.0) | < .0001 |
| Former | 449 (12.9) | 395 (14.6) | 70 (11.6) | 3 (10.3) | 773 (16.4) | 422 (13.7) | |
| Current | 209 (86.0) | 240 (88.8) | 70 (11.6) | 5 (17.2) | 770 (16.4) | 379 (12.3) | |
| Alcohol drinking | |||||||
| Never | 2,322 (66.4) | 1,312 (48.3) | 333 (55.3) | 15 (51.7) | 2,309 (49.1) | 1,489 (48.4) | < .0001 |
| Former | 139 (84.0) | 84 (83.1) | 26 (84.3) | 2 (86.9) | 164 (83.5) | 82 (82.7) | |
| Current | 1,034 (29.6) | 1,318 (48.6) | 243 (40.4) | 12 (41.4) | 2,228 (47.4) | 1,508 (49.0) | |
| Regular exercise | |||||||
| No | 1,557 (44.5) | 1,182 (43.6) | 281 (46.7) | 12 (41.4) | 2,360 (50.2) | 1,459 (47.4) | < .0001 |
| Yes | 1,938 (55.5) | 1,532 (56.4) | 321 (53.3) | 17 (58.6) | 2,341 (49.8) | 1,620 (52.6) | |
| Dietary intake from FFQ3),4) | |||||||
| Total energy (kcal/d) | 1,624.6 ± 523.0 | 1,746.8 ± 603.6 | 1,713.8 ± 509.7 1 | ,687.7 ± 453.3 | 1,745.6 ± 515.0 | 1,755.5 ± 561.3 | < .0001 |
| Carbohydrate (% energy) | 72.8 ± 887.0 | 70.1 ± 887.4 | 71.6 ± 887.2 | 67.8 ±88 7.8 | 71.2 ± 886.8 | 70.5 ± 886.9 | < .0001 |
| Protein (% energy) | 13.2 ± 882.5 | 13.9 ± 882.7 | 13.5 ±88 2.6 | 14.1 ± 882.7 | 13.2 ± 882.4 | 13.4 ± 882.4 | < .0001 |
| Fat (% energy) | 12.8 ± 885.5 | 15.2 ± 885.8 | 13.9 ± 885.5 | 17.2 ± 885.9 | 14.6 ± 885.4 | 15.2 ± 885.5 | < .0001 |
n (%) or Mean ± SD 1) P-value was evaluated by ANOVA for continuous variables and by the chi-square test for categorical variables P < 0.05. 2) Participants either only consumed one type of coffee or consumed a combination of different types of coffee (represented as combinations of four types of coffee) from 24 HR. 3) A few participants did not provide information. 4) Abbreviations: FFQ, food frequency questionnaire; BMI, body mass index
General characteristics of the study population according to the type of coffee consumed from food frequency questionnaire
| Variables | Types of coffee | P-value1) | ||||
|---|---|---|---|---|---|---|
| Nondrinkers (n=5,029) | Black coffee (n=5,154) | Coffee with sugar (n=2,323) | Coffee with cream (n=207) | Coffee with sugar and cream (n=13,191) | ||
| Age (years old) | 55.5 ± 888.0 | 51.5 ± 887.8 | 54.1 ± 888.0 | 53.0 ± 888.4 | 52.8± 888.2 | < .0001 |
| Sex | ||||||
| Men | 1,232 (24.5) | 1,297 (25.2) | 708 (30.5) | 72 (34.8) | 5,148 (39.0) | < .0001 |
| Women | 3,797 (75.5) | 3,857 (74.8) | 1,615 (69.5) | 135 (65.2) | 8,043 (61.0) | |
| Education level2) | ||||||
| Under middle school | 895 (18.2) | 409 (88.0) | 327 (14.3) | 9 (84.4) | 1,420 (10.9) | < .0001 |
| High school | 2,710 (55.2) | 2,464 (48.4) | 1,326 (57.9) | 105 (51.0) | 7,166 (55.2) | |
| College or more | 1,309 (26.6) | 2,223 (43.6) | 637 (27.8) | 92 (44.7) | 4,403 (33.9) | |
| BMI2),3) (kg/m2) | ||||||
| < 18.5 | 174 (83.5) | 106 (82.1) | 34 (81.5) | 6 (82.9) | 250 (81.9) | < .0001 |
| 18.5∼ < 23 | 2,271 (45.2) | 2,011 (39.0) | 841 (36.2) | 80 (38.7) | 5,119 (38.8) | |
| 23∼ < 25 | 1,330 (26.5) | 1,387 (26.9) | 653 (28.1) | 59 (28.5) | 3,539 (26.8) | |
| ≥ 25 | 1,253 (24.9) | 1,650 (32.0) | 795 (34.2) | 62 (29.9) | 4,282 (32.5) | |
| Smoking status | ||||||
| Never | 4,188 (83.3) | 4,002 (77.6) | 1,684 (72.5) | 142 (68.6) | 8,797 (66.7) | < .0001 |
| Former | 571 (11.4) | 694 (13.5) | 339 (14.6) | 32 (15.5) | 2,200 (16.7) | |
| Current | 268 (85.3) | 458 (88.9) | 300 (12.9) | 33 (15.9) | 2,192 (16.6) | |
| Alcohol drinking | ||||||
| Never | 3,448 (68.6) | 2,530 (49.1) | 1,133 (48.8) | 93 (44.9) | 6,223 (47.2) | < .0001 |
| Former | 187 (83.7) | 155 (83.0) | 87 (83.8) | 8 (83.9) | 428 (83.3) | |
| Current | 1,392 (27.7) | 2,469 (47.9) | 1,103 (47.5) | 106 (51.2) | 6,538 (49.6) | |
| Regular exercise | ||||||
| No | 2,279 (45.3) | 2,243 (43.5) | 1,070 (46.1) | 96 (46.4) | 6,721 (51.0) | < .0001 |
| Yes | 2,748 (54.7) | 2,911 (56.5) | 1,253 (53.9) | 111 (53.6) | 6,468 (49.0) | |
| Dietary intake from FFQ2),3) | ||||||
| Total energy (kcal/d) | 1,574.3 ± 500.0 | 1,688.1 ± 571.9 | 1,706.6 ± 548.7 | 1,760.6 ± 623.0 | 1,775.0 ± 534.5 | < .0001 |
| Carbohydrate (%) energy | 72.9 ± 887.3 | 69.9 ± 887.5 | 71.6 ± 887.1 | 69.3 ± 888.0 | 70.8 ±88 6.7 | < .0001 |
| Protein (% energy) | 13.3 ± 882.6 | 14.2 ± 882.6 | 13.5 ±88 2.5 | 13.9 ± 883.0 | 13.2 ± 882.4 | < .0001 |
| Fat (% energy) | 12.6 ± 885.7 | 15.1 ± 885.8 | 13.9 ± 885.5 | 15.9 ± 886.0 | 15.0 ±88 5.3 | < .0001 |
n (%) or Mean ± SD 1) P-value was evaluated by ANOVA for continuous variables and by the chi-square test for categorical variables P < 0.05. 2) A few participants did not provide information. 3) Abbreviations: FFQ, food frequency questionnaire; BMI, body mass index
Agreement of types of coffee between food frequency questionnaire and one-day 24-hour recall
| Coffee intake assessed from FFQ3) | Coffee intake assessed from one-day 24HR3) | % Agreement1) | Cohen's kappa2) | |||||
|---|---|---|---|---|---|---|---|---|
| Nondrinkers only | Black coffee only | Coffee with sugar only | Coffee with cream only | Coffee with sugar and cream or 3-in-1 coffee only | Combination s of four types of coffee | |||
| Nondrinkers | 1,971 (39.4) | 34 (81.8) | 8 (81.6) | 2 (86.7) | 81 (82.3) | 4 (81.2) | 59.6 | 0.4 |
| Black coffee, 1 or more cups per day | 801 (16.0) | 1,090 (58.3) | 50 (10.0) | 11 (36.7) | 234 (86.6) | 68 (20.6) | ||
| Coffee with sugar, 1 or more cups per day | 343 (86.9) | 105 (85.6) | 383 (76.5) | 0 (80.0) | 132 (83.7) | 39 (11.8) | ||
| Coffee with cream, 1 or more cups per day | 27 (80.5) | 11 (80.6) | 3 (80.6) | 13 (43.3) | 27 (80.8) | 7 (82.1) | ||
| Coffee with sugar and cream, 1 or more cups per day | 1,856 (37.1) | 630 (33.7) | 57 (11.4) | 4 (13.3) | 3,077 (86.7) | 212 (64.2) | ||
n (%) 1) Exact agreement of types of coffee between FFQs and one-day 24 HR 2) Cohen's kappa coefficient 5×5; Agreement between nondrinkers only (from one-day 24 HR) and nondrinkers only (from FFQ), black coffee only (from one-day 24 HR) and black coffee only (from FFQ), coffee with sugar only (from one-day 24 HR) and coffee with sugar (from FFQ), coffee with cream only (from one-day 24 HR) and coffee with cream only (from FFQ), and coffee with sugar and cream or 3-in-2 coffee only (from one-day 24HR) and coffee with sugar and cream (from FFQ). 3) Abbreviations: FFQ, food frequency questionnaire; 24 HR, 24-hour recall
Agreement of types of coffee between food frequency questionnaire and two-day 24-hour recall
| Coffee intake assessed from FFQ3) | Coffee intake assessed from two-day 24 HR3) | % Agreement1) | Cohen's kappa2) | |||||
|---|---|---|---|---|---|---|---|---|
| Nondrinkers only | Black coffee only | Coffee with sugar only | Coffee with cream only | Coffee with sugar and cream or 3-in-1 coffee only | Combinations of four types of coffee | |||
| Nondrinkers | 2,490 (71.2) | 147 (85.4) | 27 (84.5) | 0 (80.0) | 244 (85.2) | 21 (80.7) | 72.8 | 0.6 |
| Black coffee, 1 or more cups per day | 280 (88.0) | 1,595 (58.8) | 72 (12.0) | 15 (51.7) | 312 (86.6) | 626 (20.3) | ||
| Coffee with sugar, 1 or more cups per day | 126 (83.6) | 189 (87.0) | 374 (62.1) | 3 (10.3) | 177 (83.8) | 452 (14.7) | ||
| Coffee with cream, 1 or more cups per day | 12 (80.3) | 23 (80.9) | 4 (80.7) | 6 (20.7) | 30 (80.6) | 44 (81.4) | ||
| Coffee with sugar and cream, 1 or more cups per day | 589 (16.8) | 761 (28.0) | 125 (20.8) | 5 (17.2) | 3,938 (83.8) | 1,937 (62.9) | ||
n (%) 1) Exact agreement of types of coffee between FFQs and two-day 24 HR 2) Cohen's kappa coefficient 5x5; Agreement between nondrinkers only (from one-day 24 HR) and nondrinkers only (from FFQ), black coffee only (from one-day 24 HR) and black coffee only (from FFQ), coffee with sugar only (from one-day 24 HR) and coffee with sugar (from FFQ), coffee with cream only (from one-day 24 HR) and coffee with cream only (from FFQ), and coffee with sugar and cream or 3-in-2 coffee only (from one-day 24HR) and coffee with sugar and cream (from FFQ). 3) Abbreviations: FFQ, food frequency questionnaire; 24 HR, 24-hour recall
