Table 1 General characteristics of the studied population according to categories of total coffee and tea consumption.

From: Consumption of caffeinated beverages and kidney function decline in an elderly Mediterranean population with metabolic syndrome

 

Coffee consumption, cups/day

Tea consumption, cups/day

0 to < 1cup/day

1–2 cups/day

> 2 cups/day

0 cup/day

< 1cup/day

≥ 1 cups/day

n = 1091

n = 2631

n = 2129

n = 3948

n = 1243

n = 660

Caffeinated coffee, mL/day

5.4 ± 11.3

28.4 ± 24.8

76.9 ± 71.5

42.4 ± 55.7

43.1 ± 52.2

35.1 ± 47.6

Decaffeinated coffee, mL/day

6.3 ± 10.3

28.6 ± 24.4

59.6 ± 66.5

37.5 ± 48.9

32.8 ± 45.8

30.4 ± 44.3

Tea, mL/day

16.5 ± 40.1

10.7 ± 25.9

9.3 ± 26.0

0.0

12.8 ± 10.5

75.9 ± 49.3

Caffeine, mg/day

11.5 ± 17.9

18.9 ± 15.7

38.9 ± 31.3

23.9 ± 25.9

25.2 ± 24.5

28.8 ± 23.8

Age, years

65.4 ± 4.9

65.3 ± 4.7

64.4 ± 5.0

65.1 ± 4.9

64.8 ± 4.7

64.9 ± 4.7

Women, %

47.8

52.9

41.8

42.9

56.9

60.9

BMI, kg/m2

32.3 ± 3.5

32.5 ± 3.4

32.7 ± 3.4

32.5 ± 3.4

32.5 ± 3.4

32.4 ± 3.4

Waist circumference, cm

106.7 ± 9.7

107.0 ± 0.2

108.6 ± 9.4

107.9 ± 9.6

106.9 ± 9.5

106.3 ± 10.1

Systolic blood pressure, mmHg

140.7 ± 17.7

139.1 ± 17.0

139.3 ± 16.3

140.2 ± 17.1

138.3 ± 16.5

137.2 ± 16.2

Diastolic blood pressure, mmHg

81.4 ± 10.1

80.6 ± 9.9

80.8 ± 9.7

81.1 ± 9.9

80.4 ± 9.6

79.8 ± 9.4

Plasma fasting glucose, mg/dL

111.9 ± 27.3

112.5 ± 27.9

115.4 ± 30.8

114.2 ± 29.8

111.9 ± 27.6

110.9 ± 25.9

Plasma HD-c, mg/dL

47.6 ± 11.8

48.8 ± 11.8

47.4 ± 11.7

47.5 ± 11.6

48.6 ± 11.4

50.3 ± 13.3

Plasma triglycerides, mg/dL

149.6 ± 75.6

150.7 ± 74.4

152.8 ± 78.0

151.7 ± 75.3

151.3 ± 79.3

148.6 ± 73.7

eGFR, mL/min/1.73 m2

83.8 ± 14.5

83.5 ± 13.9

85.19 ± 13.7

84.1 ± 14.1

84.5 ± 13.4

84.3 ± 14.5

Comorbidities, %

 Obesity (BMI ≥ 30 kg/m2)

69.9

72.1

75.9

73.5

73.4

72.6

 Central obesity

94.0

96.4

96.7*

95.7

96.8

96.2

 Type 2 diabetesa

27.3

30.1

32.8

31.7

30.2

24.7

 Hypercholesterolemia

66.5

69.3

71.0

68.4

69.1

70.9

 Hypertension

82.2

84.3

83.2

84.9

81.7

78.6

 Low HDL-c

45.2

42.0

42.6

42.3

43.6

43.9

 Hypertriglyceridemia

55.4

55.9

54.8

55.8

54.1

55.8

 Hyperglycemia

75.7

74.2

76.7

75.8

75.2

73.3

 CKD (eGFR < 60 mL/min/1.73 m2)

7.8

6.4

6.3

6.8

5.7

7.3

Medication use, %

 Lipid-lowering drugs

48.7

50.8

52.4

51.1

51.9

48.5

 Oral blood glucose-lowering drugs

22.7

26.2

27.9

27.3

26.2

19.2

 Insulin treatment

3.7

4.3

4.5

4.4

3.9

3.9

 Antihypertensive drugs

77.6

78.2

78.1

79.2

76.3

74.8

 ARBs

39.3

36.3

38.6

38.6

36.4

34.9

 ACEis

31.6

31.9

30.9

32.3

29.5

30.6

Education level, %

 Primary education

48.6

52.2

46.1

51.3

45.4

44.7

 Secondary education

30.9

28.2

29.4

29.1

29.6

28.5

 Academic or graduate

20.4

19.6

24.5

18.6

25.0

26.8

Smoking status, % (n)

 Never smoked

49.5

48.5

36.4

42.7

48.9

45.1

 Former smoker

41.5

41.0

46.4

43.6

40.5

44.7

 Current smoker

9.0

10.5

17.1

13.7

10.5

10.1

Leisure time physical activity, METS. min. /week

375.8 ± 332.1

364.2 ± 338.6

350.6 ± 334.1

361.7 ± 347.5

356.6 ± 306.1

368.6 ± 317.9

MedDiet score (17-points)

8.9 ± 2.6

8.5 ± 2.7

8.2 ± 2.6

8.3 ± 2.6

8.6 ± 2.7

9.1 ± 2.7

Nutrient intake/day

 Energy, kcal

2310 ± 556

2325 ± 525

2455 ± 564

2377 ± 546

2363 ± 554

2339 ± 558

 Saturated fat, g

26.0 ± 5.2

26.1 ± 5.1

26.7 ± 5.9

26.2 ± 5.2

26.8 ± 5.6

26.0 ± 5.9

 Total protein, g

95.5 ± 14.1

97.5 ± 14.2

98.9 ± 15.5

96.8 ± 14.8

99.1 ± 14.2

99.7 ± 14.7

 Fiber, g

26.9 ± 7.8

26.7 ± 7.9

25.0 ± 7.9

24.4 ± 7.8

27.0 ± 7.7

28.9 ± 8.4

 Sodium, mg

2391 ± 509

2441 ± 530

2438 ± 542

2428 ± 544

2434 ± 498

2434 ± 515

 Magnesium, mg

410.2 ± 75.8

421.3 ± 79.2

424.5 ± 84.4

413.3 ± 79.4

429.3 ± 78.1

446.3 ± 86.1

 Potassium, mg

4245 ± 829

4481 ± 840

4537 ± 898

4408 ± 850

4561 ± 832

4724 ± 931

 Alcohol, g

10.8 ± 14.2

11.0 ± 3.5

11.6 ± 15.1

12.2 ± 15.3

8.9 ± 11.4

9.3 ± 11.8

  1. Values are means (± SD) and percentages for continuous and categorical variables, respectively.
  2. BMI body mass index, SBP systolic blood pressure, DBP diastolic blood pressure, HDL-c high-density lipoprotein-cholesterol, ARBs angiotensin-type 2 receptor blockers, ACEis angiotensin converting enzyme inhibitors, eGFR estimated glomerular filtration rate, MedDiet Mediterranean diet.
  3. aCurrent diabetes was defined as previous diagnosis of diabetes, glycated haemoglobin (HbA1c) ≥ 6.5%, use of antidiabetic medication, or having fasting glucose > 126 mg/dL in both the screening visit and baseline visit.
  4. bP value for comparisons between categories of coffee consumption was tested by ANOVA or chi2, as appropriated.
  5. The standard serving size of 1 cup was defined as 50 mL in the questionnaire.