Biochemical analysis
There were no clinically important differences in blood gas values
obtained from the two different brands of BGAs (results not shown) and
hence no need for conversion equations. Mean difference between LP and
SSLX was insignificant 0.17 mmol/L (p = 0.11). The correlations between
SSLX and umbilical arterial blood pH and lactate were dependent on the
time from FBS to delivery with the optimal correlations in women 0-25
minutes from FBS to delivery
where
R represent the correlation coefficient: R-pH = -0.30 (95% CI: -0.38 -
(-0.22)) and R-lactate = 0.57 (95% CI: 0.51-0.64) (Table not shown).
Therefore, a cohort (FBS to delivery 0-25 minutes, n = 799) was created
for calculation of ROC curves.