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Table 1 The effect of age on NK cell number

From: Ageing is associated with a decline in peripheral blood CD56bright NK cells

Age(yrs) N = Mean NK cell μl/blood (+/- SD) Mean NK cells % of lymphocytes (+/-SD)
20–40 25 194.9 (+/- 140.4) 9.25 (+/- 6.1)
40–60 23 187.6 (+/- 144.5) 10.59 (+/- 7.5)
> 60 67 205.8 (+/- 184.0) 11.22 (+/- 9.1)
  1. Statistical analysis was carried out as described in the Methods; no significant differences between groups were found.