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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