Table 2

Measurements obtained in the 34 probes with no more zero drift than predicted by manufacturers

Day NoNo of zero drift readingsZero drift (mm Hg)
RangeMeanMedianSD
 14−2 to 20.000.001.63
 26−2 to 2−0.33−0.501.36
 322.002.000.00
 44−3 to 41.252.003.40
 56−5 to 3−1.50−1.003.08
 61−4.00−4.00
 73−5 to 2−2.00−3.003.60
 92 2 to 43.003.001.41
102−7 to 4−1.50−1.507.77
111−7.00−7.00
123−5 to 82.003.006.55
  • The overall range and SD were only calculated for days when more than one reading was obtained. On day 3 both readings were 2 mm Hg, in this case range was not applicable.