Table S4. Association between the open kitchen and high cooking frequency and respiratory outcomes (crude OR and 95% CI)*.

Outcomes	Closed kitchen and high cooking frequency	Open kitchen and low cooking frequency	Open kitchen and high cooking frequency
Cough with a cold	0.97 (0.68, 1.37)	1.12 (0.66, 1.92)	0.79 (0.55, 1.14)
Cough without a cold	1.04 (0.47, 2.31)	0.93 (0.26, 3.26)	0.92 (0.40, 2.13)
Nightly cough	0.74 (0.37, 1.45)	1.05 (0.39, 2.86)	0.72 (0.35, 1.47)
Phlegm with a cold	0.92 (0.56, 1.50)	1.26 (0.62, 2.57)	0.85 (0.51, 1.42)
Phlegm without a cold	0.88 (0.26, 2.96)	1.59 (0.31, 8.07)	1.05 (0.30, 3.67)
Wheeze last year	0.59 (0.10, 3.49)	1.33 (0.16, 11.07)	0.69 (0.11, 4.44)
Wheeze with a cold	1.42 (0.64, 3.14)	2.42 (0.88, 6.62)	1.09 (0.48, 2.50)
Wheeze without a cold	0.53 (0.15, 1.87)	1.11 (0.18, 6.76)	0.65 (0.18, 2.40)
Daytime and nightly wheeze	0.31 (0.10, 0.99)*	1.25 (0.27, 5.73)	0.64 (0.20, 1.99)
Wheeze while sleeping	0.58 (0.27, 1.28)	1.28 (0.31, 5.28)	–
Wheeze while speaking	0.54 (0.09, 3.17)	1.00 (0.11, 8.85)	0.32 (0.05, 2.25)
Ever asthma	2.14 (0.51, 8.99)	3.32 (0.59, 18.51)	1.90 (0.44, 8.26)
Recent asthma	0.84 (0.19, 3.73)	1.63 (0.23, 11.83)	0.39 (0.07, 2.16)
Recent bronchitis	2.71 (1.36, 5.43)*	2.34 (0.94, 5.81)	2.51 (1.24, 5.09)*
Recent pneumonia	0.73 (0.16, 3.29)	0.82 (0.07, 9.15)	0.59 (0.12, 2.97)
Ever allergy	1.50 (0.79, 2.84)	0.88 (0.31, 2.47)	0.90 (0.45, 1.77)
Recent allergy	1.42 (0.56, 3.61)	0.97 (0.23, 4.17)	0.87 (0.32, 2.34)
Recent allergic rhinitis	1.84 (1.04, 3.26)*	1.62 (0.72, 3.64)	1.50 (0.83, 2.70)

*, referring to closed kitchen and low cooking frequency. Significant findings (P<0.05) are with *.