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Table 1 Participant demographics

From: Association between cortisol and aging-related hippocampus volume changes in community-dwelling older adults: a 7-year follow-up study

 

Overall

Men

Women

Statistical significance

N

70

16

54

 

Age (years, Timepoint 1), mean ± SD

72.69 ± 4.29

72.69 ± 3.18

72.69 ± 4.60

P = 0.998a

Cortisol (ng/ml, Timepoint 1), mean ± SD

75.62 ± 20.27

72.32 ± 17.30

76.60 ± 21.12

P = 0.416a

Education (years), mean ± SD

9.89 ± 1.70

10.81 ± 2.10

9.61 ± 1.47

P = 0.046a

MRI interval (years, Timepoint 1 to Timepoint 2), mean ± SD

6.88 ± 0.62

6.86 ± 0.64

6.88 ± 0.62

P = 0.928a

BMI (kg/m2), mean ± SD

23.90 ± 3.22

23.98 ± 2.73

23.87 ± 3.37

P = 0.902a

Hypertension, n (%)

29 (42.6)

6 (40.0)

23 (43.4)

P = 1.000b

Diabetes, n (%)

14 (20.3)

3 (18.8)

11 (20.8)

P = 1.000b

Dyslipidemia, n (%)

26 (37.7)

3 (18.8)

23 (43.4)

P = 0.087b

Blood collection time, n (%)

AM

36 (51.4)

6 (37.5)

30 (55.6)

P = 0.260b

PM

34 (48.6)

10 (62.5)

24 (44.4)

 
  1. Missing data: BMI (N = 2), Hypertension (N = 2), Diabetes (N = 1), Dyslipidemia (N = 1)
  2. The blood collection time was defined as “AM” for 9:00 to 12:00 collection and “PM” for 12:00 to 15:00 collection
  3. aWelch’s t-test and
  4. bFisher’s exact test
  5. BMI Body mass index