Sample

Mean ± SD

Paired t-test (pairs compared)

Sig. (2-tailed)

COHb on admission

23.05 ± 13.44

COHb after 1year

23.74 ± 12.98

COHb on admission and after 1 year

0.068

COHb after 2years

23.68 ± 13.11

COHb on admission and after 2 years

0.078

COHb after 3years

23.46 ± 12.92

COHb on admission and after 3 years

0.326

COHb at 37ºC (12hs)

23.13 ± 13.15

COHb on admission and at 37ºC

0.691

COHb at 40ºC (5hs)

23.64 ± 12.92

COHb on admission and at 40ºC

0.160

COHb at 50ºC (1 h)

23.56 ± 12.97

COHb on admission and at 50ºC

0.229

P>0.05 (insignificant)
Table 2: Comparison of carboxyhaemoglobin% (mean ± SD) in refrigerated stored blood samples at different periods and after incubation at various temperatures and durations (n=14).