outcome	cooking_heating	cat_cont	label	Pooled OR (95% CI)	Prediction interval	n_studies	N effect estimates	I2 (p-value)
asthma	cooking	cat	nolin	1.26 (0.89; 1.79)	0.53; 2.99	6	8	72 (0.001)
asthma	cooking	cat	nolin_study	1.37 (0.69; 2.7)	0.32; 5.93	4	5	80 (0.001)
asthma	cooking	cat	noRR	1.3 (0.96; 1.78)	0.61; 2.78	8	9	69 (0.001)
asthma	cooking	cat	gr4mo	1.39 (0.93; 2.06)	0.61; 3.15	4	6	58 (0.037)
asthma	cooking	cat	cohort_rct	1.39 (0.93; 2.06)	0.61; 3.15	4	6	58 (0.037)
asthma	cooking	cat	cross_sect	1.17 (0.65; 2.11)	0.39; 3.56	5	5	61 (0.035)
asthma	cooking	cat	0_17	1.26 (0.93; 1.71)	0.58; 2.74	8	10	67 (0.001)
asthma	cooking	cat	namer	1.39 (0.51; 3.77)	0.2; 9.63	3	4	69 (0.022)
asthma	cooking	cat	europe	1.32 (0.92; 1.89)	0.75; 2.32	4	5	28 (0.233)
asthma	cooking	cat	gas_under30	1.4 (0.76; 2.58)	0.44; 4.41	5	5	51 (0.088)
asthma	cooking	cat	gas_gr30	1.23 (0.82; 1.84)	0.52; 2.93	5	6	70 (0.005)
asthma/respiratory symptoms	cooking	cat	nolin	1.11 (0.96; 1.28)	0.71; 1.74	10	49	46 (0)
asthma/respiratory symptoms	cooking	cat	nolin_study	1.09 (0.97; 1.21)	0.84; 1.4	6	28	42 (0.012)
asthma/respiratory symptoms	cooking	cat	noRR	1.1 (0.94; 1.3)	0.62; 1.95	13	57	49 (0)
asthma/respiratory symptoms	cooking	cat	less4mo	1.11 (0.88; 1.39)	0.53; 2.33	10	39	56 (0)
asthma/respiratory symptoms	cooking	cat	cross_sect	1.11 (0.88; 1.39)	0.53; 2.33	10	39	56 (0)
asthma/respiratory symptoms	cooking	cat	0_17	1.13 (0.91; 1.41)	0.55; 2.34	10	37	57 (0)
asthma/respiratory symptoms	cooking	cat	18_plus	1.1 (0.97; 1.24)	0.92; 1.31	3	20	15 (0.262)
asthma/respiratory symptoms	cooking	cat	namer	1.37 (0.64; 2.93)	0.33; 5.67	2	12	62 (0.002)
asthma/respiratory symptoms	cooking	cat	europe	1.04 (0.83; 1.29)	0.59; 1.81	6	34	26 (0.085)
asthma/respiratory symptoms	cooking	cat	africa	1.11 (0.59; 2.1)	0.33; 3.74	2	6	61 (0.026)
asthma/respiratory symptoms	cooking	cat	gas_under30	0.95 (0.7; 1.3)	0.45; 2	5	15	54 (0.006)
asthma/respiratory symptoms	cooking	cat	gas_gr30	1.17 (0.96; 1.42)	0.69; 1.96	7	41	43 (0.002)
asthma/respiratory symptoms	cooking	cont	nolin	1.8 (0.95; 3.4)	0.42; 7.61	5	35	49 (0.001)
asthma/respiratory symptoms	cooking	cont	nolin_study	2.2 (1.09; 4.43)	0.43; 11.3	4	29	49 (0.002)
asthma/respiratory symptoms	cooking	cont	noRR	2.2 (1; 4.8)	0.44; 10.92	4	21	44 (0.017)
asthma/respiratory symptoms	cooking	cont	less4mo	1.33 (0.92; 1.94)	0.63; 2.82	4	36	44 (0.003)
asthma/respiratory symptoms	cooking	cont	cohort_rct	1.38 (0.7; 2.73)	0.43; 4.43	2	24	19 (0.198)
asthma/respiratory symptoms	cooking	cont	cross_sect	2.51 (0.75; 8.46)	0.25; 25.1	3	13	60 (0.003)
asthma/respiratory symptoms	cooking	cont	0_17	1.33 (0.92; 1.94)	0.63; 2.82	4	36	44 (0.003)
asthma/respiratory symptoms	cooking	cont	namer	2.2 (1; 4.8)	0.44; 10.92	4	21	44 (0.017)
asthma/respiratory symptoms	cooking	cont	gas_gr30	1.9 (0.8; 4.55)	0.3; 12.13	4	29	59 (0)
asthma/respiratory symptoms	cooking	cont	wo_schachter	1.75 (0.77; 4.02)	0.3; 10.13	4	33	48 (0.001)
asthma/respiratory symptoms	heating	cat	nolin	1.24 (1.02; 1.5)	0.85; 1.81	4	13	50 (0.02)
asthma/respiratory symptoms	heating	cat	nolin_study	1.24 (1.02; 1.5)	0.85; 1.81	4	13	50 (0.02)
asthma/respiratory symptoms	heating	cat	noRR	1.23 (0.77; 1.95)	0.5; 3	3	6	66 (0.012)
asthma/respiratory symptoms	heating	cat	gr4mo	1.3 (1.23; 1.38)	1.23; 1.38	3	10	0 (0.584)
asthma/respiratory symptoms	heating	cat	cohort_rct	1.24 (1.02; 1.5)	0.85; 1.81	4	13	50 (0.02)
asthma/respiratory symptoms	heating	cat	0_17	1.3 (1.23; 1.38)	1.23; 1.38	3	10	0 (0.584)
asthma/respiratory symptoms	heating	cat	gas_gr30	1.2 (0.95; 1.5)	0.78; 1.84	3	12	53 (0.016)
systemic symptoms	cooking	cat	nolin	1.04 (0.97; 1.13)	0.97; 1.13	4	9	0 (0.789)
systemic symptoms	cooking	cat	nolin_study	1.1 (0.46; 2.61)	0.46; 2.61	2	2	0 (0.957)
systemic symptoms	cooking	cat	noRR	1.04 (0.97; 1.13)	0.97; 1.13	4	9	0 (0.789)
systemic symptoms	cooking	cat	gr4mo	1.03 (0.89; 1.19)	0.89; 1.19	2	5	0 (0.48)
systemic symptoms	cooking	cat	less4mo	1.05 (0.92; 1.21)	0.92; 1.21	2	4	0 (0.782)
systemic symptoms	cooking	cat	cohort_rct	1.03 (0.89; 1.19)	0.89; 1.19	2	5	0 (0.48)
systemic symptoms	cooking	cat	cross_sect	1.05 (0.92; 1.21)	0.92; 1.21	2	4	0 (0.782)
systemic symptoms	cooking	cat	0_17	1.04 (0.96; 1.13)	0.96; 1.13	3	8	0 (0.718)
systemic symptoms	cooking	cat	gas_gr30	1.04 (0.97; 1.13)	0.97; 1.13	4	9	0 (0.789)