Table 1.
Respiratory variables during the course of the study, showing data binned according to the timing of each study relative to advanced labour
| Pre-labour > 6 days (n = 3) | Pre-labour 3–6 days (n = 7) | Pre-labour 1–3 days (n = 8) | Early labour (n = 8) | Advanced labour (n = 8) | |
|---|---|---|---|---|---|
| [Hb] (g dl−1) | 11.3 ± 0.3 | 11.3 ± 0.3 | 11.9 ± 0.4 | 12.1 ± 0.6 | 11.7 ± 0.4 |
| pHa | 7.35 ± 0.00 | 7.34 ± 0.01 | 7.35 ± 0.00 | 7.34 ± 0.01 | 7.33 ± 0.01 |
| Sa,O2 (%) | 53.5 ± 4.3 | 55.8 ± 2.1 | 52.6 ± 2.6 | 47.2 ± 2.3 | 43.7 ± 4.9 |
| Pa,O2 (mmHg) | 23.9 ± 2.6 | 24.8 ± 1.3 | 23.9 ± 1.4 | 22.8 ± 1.1 | 21.7 ± 1.3 |
| Pa,CO2 (mmHg) | 53.9 ± 0.8 | 53.9 ± 0.8 | 53.2 ± 0.8 | 55.1 ± 1.0 | 54.6 ± 1.3 |
Values are means ± S.E.M. Note that n signifies the number of fetuses contributing data to each bin. [Hb], haemoglobin concentration; pHa, arterial pH; Sa,O2, arterial saturation; Pa,O2, arterial partial pressure of O2; Pa,CO2, arterial partial pressure CO2.