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Clinical InvestigationsSleep and BreathingReference Values for Nocturnal Home Pulse Oximetry During Sleep in Primary School Children
Section snippets
Subject Recruitment
Twenty-seven of the 59 regular primary schools located within the city limits of Hannover, Germany, were selected at random within strata of socioeconomic status (ie, the percentage of pupils from low-income families). Eleven of the selected schools were contacted between February 2001 and May 2001, and all children attending third grade were identified. With institutional review board approval, parental informed consent and child assent were obtained. Of the 739 children attending third grade,
Results
All recordings contained analyzable data, but 10 recordings (10%; seven of these were from boys) had to be excluded because of insufficient (< 5 h) recording time. The remaining recordings were from 54 girls and 36 boys studied at a mean age of 9.3 years (SD, 0.6). Mean height was 137.5 cm (SD, 6.6), mean weight was 31.8 kg (SD, 5.9), and mean body mass index was 16.7 (SD, 2.3). Mean TRT was 591.2 min (SD, 61.3), with an AFRT of 578.3 min (SD, 63.8), ie, 97.4% (SD, 6.1) of recording time was
Discussion
Using new-generation, motion-resistant pulse oximetry and sophisticated methods to exclude spuriously low Spo2 values without having to analyze the pulse waveform signal throughout, we determined baseline Spo2 and the frequency of intermittent falls in Spo2 (desaturations) in a group of primary school children. Our subject recruitment and selection procedures enabled us to establish population-based reference values for NHPO recordings in this age group. We found that average Spo2 was
ACKNOWLEDGMENT
The authors thank Dr. Ehrhardt (Department of Public Health, City Council, Hannover, Germany), Mrs. Martinsen (Supervisory School Authority, Hannover, Germany), Mr. Hegemann (District Government, Hannover, Germany), and the headmasters and teachers of the participating schools for their support and cooperation. Our thanks also go to E. Fiege and A. Guenther for their help with obtaining the recordings, R. Downes (Getemed AG; Teltow, Germany) for technical assistance, and particularly to the
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Mrs. Urschitz-Duprat was supported by a research grant from the Hans Meineke Foundation, Hannover, Germany.
Oximeter sensors were provided by Masimo Corporation, Irvine, CA.