Table 1– Characteristics of studies included in the meta-analysis
First author [ref.]YearSampleControl subjectsOSA subjects
Subjects nAge
yrs
MalesEthnicityBMI kg·m−2Subjects nAge yrsMalesEthnicityHTBMI kg·m−2Phenotype AHI events·h−1
Barceló [12]2001R3249±1100Caucasian 96.725.6±0.64450±1100Caucasian 96.7NM32.8±0.654.5±2.5
Benjamin [2]2008R5243.5957.7Caucasian 10032.3±5.22647.5±11.280.8Caucasian 10046.238.4±8.0Defined as 4% oxygen dip ≥10
Boström [18]2007C108NM42.8Caucasian 96.7NM230NM50.2Caucasian 96.753.9NMOSA defined as AHI ≥10
Li [15]2004R3045.286.7Asian 10026.96042.9±8.293.3Asian 1005029.3±3.959.3±29.0
Lin [6]2004C626NMNMCaucasian 96.7NM474NM54Caucasian 96.756.4NMOSA defined as AHI ≥5
Ogus [19]2010R7960.1±1045.6Caucasian 96.7NM9751.3±9.990.7Caucasian 100NM30.6±5.824.24±18.34
Xiao [20]1998R5030.9±6.660Asian 100NM5050.9±10.590Asian 1005029.6±6.739±23.3
Yakut [13]2010R3749.9±10.470.2Caucasian 96.728.5±4.66450.4±11.282.8Caucasian 100NM30.6±4.3OSA defined as AHI ≥5
Zhang [14]2000R11354.0±12.464.6Asian 10026.2±4.46154.4±11.385.2Asian 10010028.5±2.931.3±17.3
Zhang [16]2004R10040.1±2.1100Asian 10026.2±2.012143.2±2.3100Asian 100NM28.8±1.4OSA/HS defined as AHI ≥5
  • Data presented as mean±sem or %, unless otherwise stated. OSA: obstructive sleep apnoea; BMI: body mass index; HT: hypertension, as defined by the authors: AHI: apnoea/hypopnoea index; R: OSA subjects referred from clinic; C: OSA subjects derived from a screened community; NM: not mentioned; OSA/HS: OSA/hypopnoea syndrome.