Obstructive sleep apnea in New Zealand adults: prevalence and risk factors among Māori and non-Māori.
OBJECTIVE
Examine the distribution of symptoms and risk factors, and estimate the prevalence of obstructive sleep apnea (OSA) among Māori and non-Māori New Zealanders.


METHODS
Mail-out survey to a stratified random sample from the electoral roll of 10,000 people aged 30-59 y, and overnight MESAM IV monitoring during sleep of a similarly aged stratified random sample of 364 people from the Wellington electoral roll.


METHODS
Nationwide survey of OSA symptoms (71% response rate) and regional home-based measurement of respiratory disturbance index (RDI, 4% oxygen desaturations/h of sleep, plus bursts of snoring or > or = 10/min increase in heart rate).


METHODS
Sample designs aimed for equal numbers of Māori and non-Māori participants, men and women, and participants in each decade of age.


METHODS
N/A.


RESULTS
Māori were more likely than non-Māori to report OSAS risk factors and symptoms. After controlling for sex and age, Māori were 4.3 times more likely to have RDI > or = 15 (95% CI = 1.3-13.9). Ethnicity was not an independent risk factor after controlling for body mass index (BMI) and neck circumference. The prevalence of OSAS (RDI > or = 5 and ESS > 10) was conservatively estimated to be 4.4% for Māori men, 4.1% for non-Māori men, 2.0% for Māori women, and 0.7% for non-Māori women.


CONCLUSIONS
The national survey and the regional monitoring study indicate a higher prevalence of OSA among Māori and among men. The higher prevalence among Māori appears to be attributable to recognized risk factors, notably body habitus. In addition to increased prevention and treatment services, strategies are needed to reduce ethnic disparities in OSAS prevalence.
Mihaere
Kara M
KM
Sleep/Wake Research Centre, Research School of Public Health, Massey University, Wellington, New Zealand.
Harris
Ricci
R
Gander
Philippa H
PH
Reid
Papaarangi M
PM
Purdie
Gordon
G
Robson
Bridget
B
Neill
Alister
A
D000328:Adult; D015992:Body Mass Index; D005006:Ethnicity / Q000706:statistics & numerical data; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D009520:New Zealand / Q000453:epidemiology / Q000208:ethnology; D016017:Odds Ratio; D017286:Polysomnography / Q000379:methods / Q000706:statistics & numerical data; D015995:Prevalence; D012306:Risk; D012307:Risk Factors; D017678:Sex Distribution; D020181:Sleep Apnea, Obstructive / Q000453:epidemiology* / Q000208:ethnology; D011795:Surveys and Questionnaires; D044465:White People / Q000208:ethnology / Q000706:statistics & numerical data*