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Table 1 Studies included in the systematic review and meta-analysis (N = 26)

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

First author

(year), country

Study

design

N

Recruitment

Participants

Sex

Exposure

variable

Outcome

measures

Number of outcome events/ cases

Comparison

Anuntaseree (2001), Thailand

Cross-sectional

1142

Community

Children aged 6–13 years

Boys and girls

Household smoking

Ali’s questionnaire

Smoking in household: 47; non-smoking in household: 38

Habitual snoring: most nights

Brunetti (2001), Italy

Cross-sectional

1207

Community

Children aged 3–11 years

Boys and girls

Passive smoking

PSG

Passive smoking: 4; non passive smoking: 10

AHI > 3

Castronovo (2002), Australia

Cross-sectional

604

Community

Children aged 2–8 years

Boys and girls

Passive smoking

Snoring questionnaire

Passive smoking: 80; non passive smoking: 74

Habitual snoring: always and often

Corbo (1989), Italy

Cross-sectional

940

Community

Children aged 6–13 years

Boys and girls

Parental smoking

Snoring questionnaire

Parental smoking exposure: 82; non parental smoking exposure: 36

Habitual snoring: snoring often

Corbo (2001), Italy

Cross-sectional

2209

Community

Children aged 10–15 years

Boys and girls

Parental smoking

Snoring questionnaire

Parental smoking exposure: 89; non parental smoking exposure: 34

Habitual snoring: snoring often

Ersu (2004), Turkey

Cross-sectional

2147

Community

Children aged 5–13 years

Boys and girls

Paternal smoking

Brouillette’s questionnaire

Paternal smoking exposure: 21; non- paternal smoking exposure: 5

High risk of OSAS: the questionnaire criteria by Brouillette et al

Franklin (2004), Sweden

Cross-sectional

15,555

Community

Adult (25–54 years)

Men and women combined

Passive smoking

Basic Nordic Sleep Questionnaire

Passive smoking exposure: 86; non-passive smoking exposure: 807

Habitual snoring: loud and disturbing snoring at least 3 nights a week

Gill (2012), New Zealand

Cross-sectional

823

Community

Children aged 3 years 0 months to 3 years 12 months

Boys and girls

Household smoking

Goldstein’s questionnaire

NR

Habitual snoring: often (4–6 night/week) or always (every night/day)

Gozal (2008), USA

Cross-sectional

16,321

Community

Children aged 5–7 years

Boys and girls

Household smoking

Gozal’s sleep questionnaire

Household smoking: 666; non household smoking: 1178

Habitual snoring: almost always (> 4 nights/week) or always on snoring frequency and medium loud to loud on loudness of snoring

Huang (2019), China

Retrospective

209

Clinic

Older than 18 years

Men and women combined

SHS

PSG

SHS exposure: 87; non- SHS exposure: 61

AHI5

Kaditis (2004), Greece

Cross-sectional

3666

Community

Children and adolescents aged 1–18 years

Boys and girls

Passive smoking

Brouilette’s questionnaire

Passive smoking exposure:106; non passive smoking exposure: 48

Habitual snoring: snoring every night

Kannan (2017), USA

Prospective cohort

609

Community

Child at age 4

Boys and girls

SHS

Snoring questionnaire

SHS exposure: 52; non-SHS exposure: 77

Habitual snoring 3 nights/week

Kheirandish-Gozal (2014), Iran

Cross-sectional

6000

Community

Children aged 6–12 years

Boys and girls

Parental smoking

Gozal’s sleep questionnaire

NR

Habitual snoring 3 nights/week

First author (year), country

Study design

N

Recruitment

Participants

Sex

Exposure variable

Outcome Measures

Number of outcome events/ cases

Comparison

Kuehni (2008), UK

Cross-sectional

3245

Community

Children aged 1–4 years

Boys and girls

Parental smoking

Corbo’s questionnaire

Parental smoking exposure: 241; non-parental smoking exposure: 290

Habitual snoring: snoring almost always

Li AM (2010), Hong Kong

Cross-sectional

9172

Community

Children aged 5–14 years

Boys and girls

Household smoking

Hong Kong Children Sleep Questionnaire

Household smoking: 143; non household snoring: 311

Habitual snoring: frequently, three nights or more per week

Li S (2010), China

Cross-sectional

20,152

Community

Children aged 5.08–11.99 years

Boys and girls

Household passive smoking

Children’s Sleep Habits Questionnaire

Household passive smoking: 666; non household passive smoking: 1750

Habitual snoring: frequently (2–4 nights/week) or always (5–7 nights/week)

Nosetti (2011), Italy

Case–control

1610

Community

Children aged 0–14 years

Boys and girls

SHS

PSG

SHS exposure: 274; non-SHS exposure: 306

AHI (NR)

Ohida (2007), Japan

Cross-sectional

19,386

Clinic

Pregnant women

Women

SHS

7 items questionnaire

SHSexposure: 10,269; non-SHS exposure: 9023

Snoring (often or always)

Owen (1996),

Cross-sectional

245

Community

Children aged 0–11 years

Boys and girls

Parental smoking

Owen’s questionnaire

Parental smoking exposure: 39; non parental smoking exposure: 27

Snoring (sometimes or often)

Sahin (2009), Turkey

Cross-sectional

1605

Community

Children aged 7–13 years

Boys and girls

Household smoking

Ersu’s questionnaire

Household smoking: 28; non household smoking: 14

Habitual snoring: frequently or almost every day

Sogut (2005), Turkey

Cross-sectional

1344

Community

Children aged 3–11 years

Boys and girls

Passive smoking

PSG

Passive smoking: 11; non passive smoking: 4

AHI > 3

Sogut (2009), Turkey

Cross-sectional

1030

Community

Adolescents aged 12–17

Boys and girls

Exposure to father smoking

55-item questionnaire

Exposure to father smoking: 25; non-father smoking: 16

Habitual snoring: often and always

Urschitz (2004), Germany

Cross-sectional

1760

Community

Children aged 9 ± 0.7 years

Boys and girls

Household smoking

Sleep-disordered breathing questionnaire

Household smoking: 62; non household smoking: 50

Habitual snoring: frequently and always

Włodarska (2020), Poland

Cross-sectional

160

Community

Children aged 6–18 years

Boys and girls

Exposure to tobacco smoke at home

PSG

Exposure group: 17; non exposure group: 3

Children aged < 13 years, AHI > 1.5; children aged > 13, AHI > 5

Zhang (2004), Australia

Cross-sectional

985

School

Children aged 4–12 years

Boys and girls

Household smoking

Rumchev’s questionnaire

Household smoking exposure: 84; non-household smoking exposure: 65

Habitual snoring more than 4 times/week

Zhu (2013), Hong Kong

Cross-sectional

2954

Community population

Preschool children aged 2–6 years

Boys and girls

Household smoking

The Hong Kong Paediatric Sleep Survey

household smoking exposure: 52; non-household smoking exposure: 68

Habitual snoring 3 nights/week

  1. SHS Secondhand Smoke, AHI Apnea–Hypopnea Index, PSG Polysomnography, NR Not reported