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Clin Respir J. 2018 May;12(5):1900-1904. doi: 10.1111/crj.12753. Epub 2018 Jan 4.

Sex-linked difference in blood oxygen saturation.

Author information

1
Pediatric Pulmonology Institute, Shaare Zedek Medical Center, Hebrew University Medical School, Jerusalem, Israel.
2
Neonatology Department, Shaare Zedek Medical Center, Hebrew University Medical School, Jerusalem, Israel.
3
Pediatric Department, Shaare Zedek Medical Center, Hebrew University Medical School, Jerusalem, Israel.
4
Neonatology Department, the Tel Aviv Medical Center, and the Sackler School of Medicine, Tel Aviv, Israel.
5
Pulmonology Institute Shaare Zedek Medical Center, Hebrew University Medical School, Jerusalem, Israel.

Abstract

BACKGROUND:

It is not known whether SpO2 in healthy volunteers is affected by sex.

OBJECTIVE:

To evaluate whether there are differences in SpO2 between young healthy adult males and females and to evaluate whether the differences are already present at birth.

METHODS:

We studied two cohorts of patients. The first one consisted of young adult volunteers (105 males and 102 females). In these patients, SpO2 was measured as well as selected anthropometric variables (height, weight), vital signs (respiratory rate, pulse rate and body temperature) and obtained data on menstrual cycle phase of the female participants. For the second cohort, we reanalyzed data from a previous prospective study that was performed to compare SpO2 of newborns infants born at different altitudes (sea level or 760 m above sea level).

MEASUREMENTS AND MAIN RESULTS:

In young male adults, mean SpO2 was 97.1% ± 1.2% versus 98.6% ± 1.0% in females (P < .001). This difference remained significant (P = .002) after correction for BMI, BSA and age, variables that were significantly different between sexes in univariate analysis. The SpO2 in females was unaffected by menstrual phase. In contrast to findings in adults, there were no significant differences in SpO2 measurements in newborn infants attributable to sex.

CONCLUSIONS:

Healthy young female adults have a higher (1.5%) SpO2 than their male counterparts. This difference is not yet present at birth. Further studies are needed to determine the timing of sex-differences, and to better define the mechanism(s) behind this observation.

KEYWORDS:

age; blood oxygen saturation; gender; menstrual cycle; sex

PMID:
29227023
DOI:
10.1111/crj.12753
[Indexed for MEDLINE]

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