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. 2018 Jul 3;68(673):e524–e530. doi: 10.3399/bjgp18X697937

Table 1.

Description of cohort, n = 485

Descriptor Data
Age in years at first test
  Mean (SD) 72.1 (6.8)
  Range 60.0–93.2

Sex
  Female, % 57.5

Time between tests in days
  Mean (SD) 153 (107)
  Median (IQR) 112.5 (100–147)

Ethnicity, n
  White 449
  Mixed ethnicity 4
  Black 1

IQR = interquartile range. SD = standard deviation.