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Table 4 Subgroup analysis of risk ratio based on participants expose to father smoking or mother smoking

From: What is the association between secondhand smoke (SHS) and possible obstructive sleep apnea: a meta-analysis

Subgroup

Pooled risk ratio

95% confidence interval

Study participants

Father smoker

Anuntaseree (2001), Thailand

1.10

0.78 - 1.57

Ersu (2004), Turkey

3.53

1.34 - 9.30

Gill (2012), New Zealand

1.70

1.00 - 2.80

Sahin (2009), Turkey

1.62

0.89 - 2.93

Sogut (2009), Turkey

1.56

0.85 - 2.87

Subtotal

1.43

1.13 - 1.81

Mother smoker

Brunetti (2011), Italy

9.75

3.22 - 29.56

Ersu (2004), Turkey

3.48

1.61 - 7.51

Gill (2012), New Zealand

1.70

1.00 - 3.00

Li S (2010), China

1.65

1.34 - 2.02

Sahin (2009), Turkey

1.63

0.82 - 3.24

Sogut (2005), Turkey

2.19

0.70 - 6.84

Sogut (2009), Turkey

2.17

1.18 - 4.00

Subtotal

1.84

1.55 - 2.18