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Table 1 Specifications of the included studies

From: The prevalence of obstructive sleep apnea in patients with type 2 diabetes: a systematic review and meta-analysis

Author Name

Year of study

Place of study

OSA diagnostic tool

Sample size

Prevalence (%)

Average age

Men (%)a

Mean of BMIab

Quality assessment

Kalakattawi et al.

2017

Saudi Arabia

Questionnaire

197

15.2

56.1

0.44

_

7

Lam et al.

2010

Hong kong

Device

824

53.9

57.4

0.62

26.0

8

Lecome et al.

2012

France

Questionnaire

3894

85.0

66.0

0.58

–

8

Nasseri et al.

2015

Iran

Questionnaire

173

54.0

55.4

–

27.9

10

Obaseki et al.

2014

Nigeria

Questionnaire

117

27.0

63.0

0.44

27.5

8

Ozol et al.

2011

Turkey

Questionnaire

237

47.3

58.6

0.53

30.3

6

SHim et al.

2011

South Korea

Questionnaire

784

15.8

54.0

0.50

24.8

9

Sokwalla et al.

2017

Kenya, Africa

Questionnaire

223

44.4

56.8

0.46

28.8

9

Tahrani et al.

2012

UK

Device

234

65.0

58.5

0.67

34.4

7

Vale et al.

2015

Portugal

Device

23

60.0

62.2

0.30

29.2

7

Viswanathan et al.

2017

Chennai

Device

203

23.6

54.0

0.71

29.1

8

Westlake et al.

2016

Prague

Device

294

72.0

64. 7

0.59

31.1

7

Zhang et al.

2016

China

Device

880

60.0

60.5

0.53

25.1

10

Zhang et al.

2015

China

Device

337

66.7

54.5

_

26.5

10

Burgess, K.R

2013

Queensland and New South Wales

Device

1109

71.0

53.0

0.62

31.8

8

Amin et al. (Asians)

2017

South Asians

Device

105

51.0

54.5

0.58

30.7

9

Amin et al. Europeans)

2017

Europeans

Device

129

75.2

59.3

0.57

37.4

9

Donovan et al.

2017

Israel

Questionnaire

818

90.3

63.5

_

32.5

8

Sadeghniiat et al.

2015

Iran

Questionnaire

173

74.0

61.6

0.44

28.8

9

  1. aCells that are empty have not been reported in the relevant articles
  2. bBody Mass Index