Table 4

Meta-meta-analyses and robustness of evidence assessment by domain

Included reviewsaLevel of comparisonRandom-effects summary ES (95% CI); P valueSample size; N of included studiesES (95% CI) in the largest studyI2 (%)Egger’s test P valueExcess statistical significance test P value95% prediction intervalRobustness of evidence
Air pollution
Alexeeff et al.34
Chen et al. 2020
RR per 10 µg/m3 increase in PM2.5 for IHD mortality1.21 (1.10–1.33); < 0.0001>1000; 29 studies1.64 (1.62–1.66)98.16%0.360.210.7852–1.8617Highly suggestive
Yang et al.41
Chen et al. 2020
RR per 10 µg/m3 increase in PM2.5 for CVD mortality1.11 (1.09–1.14); < 0.0001>1000; 26 studies1.06 (1.04–1.08)74.23%0.080.371.0303–1.1959Highly suggestive
Stieb et al.40
Atkinson et al.35
HR per 10 ppb increase in NO2 for CeVD mortality1.03 (1.00–1.06); 0.07>1000; 14 studies1.01 (0.98–1.05)45.64%0.090.410.9581–1.1044Non-significant
Ambient temperature
Bunker et al.49
Moghadamnia et al.50
RR per 1°C change of temperature (heat) for CVD mortality1.04 (1.03–1.04); < 0.0001>1000; 62 studies1.013 (1.010–1.015)98.63%< 0.0001< 0.011.0225–1.0538Highly suggestive
Included reviewsaLevel of comparisonRandom-effects summary ES (95% CI); P valueSample size; N of included studiesES (95% CI) in the largest studyI2 (%)Egger’s test P valueExcess statistical significance test P value95% prediction intervalRobustness of evidence
Air pollution
Alexeeff et al.34
Chen et al. 2020
RR per 10 µg/m3 increase in PM2.5 for IHD mortality1.21 (1.10–1.33); < 0.0001>1000; 29 studies1.64 (1.62–1.66)98.16%0.360.210.7852–1.8617Highly suggestive
Yang et al.41
Chen et al. 2020
RR per 10 µg/m3 increase in PM2.5 for CVD mortality1.11 (1.09–1.14); < 0.0001>1000; 26 studies1.06 (1.04–1.08)74.23%0.080.371.0303–1.1959Highly suggestive
Stieb et al.40
Atkinson et al.35
HR per 10 ppb increase in NO2 for CeVD mortality1.03 (1.00–1.06); 0.07>1000; 14 studies1.01 (0.98–1.05)45.64%0.090.410.9581–1.1044Non-significant
Ambient temperature
Bunker et al.49
Moghadamnia et al.50
RR per 1°C change of temperature (heat) for CVD mortality1.04 (1.03–1.04); < 0.0001>1000; 62 studies1.013 (1.010–1.015)98.63%< 0.0001< 0.011.0225–1.0538Highly suggestive

RR, relative risk; HR, hazard ratio; CVD, cardiovascular disease; IHD, ischaemic heart disease; CeVD, cerebrovascular disease.

A bibliography of the abovementioned reviews is presented in Supplementary material online, Appendix S3.

Table 4

Meta-meta-analyses and robustness of evidence assessment by domain

Included reviewsaLevel of comparisonRandom-effects summary ES (95% CI); P valueSample size; N of included studiesES (95% CI) in the largest studyI2 (%)Egger’s test P valueExcess statistical significance test P value95% prediction intervalRobustness of evidence
Air pollution
Alexeeff et al.34
Chen et al. 2020
RR per 10 µg/m3 increase in PM2.5 for IHD mortality1.21 (1.10–1.33); < 0.0001>1000; 29 studies1.64 (1.62–1.66)98.16%0.360.210.7852–1.8617Highly suggestive
Yang et al.41
Chen et al. 2020
RR per 10 µg/m3 increase in PM2.5 for CVD mortality1.11 (1.09–1.14); < 0.0001>1000; 26 studies1.06 (1.04–1.08)74.23%0.080.371.0303–1.1959Highly suggestive
Stieb et al.40
Atkinson et al.35
HR per 10 ppb increase in NO2 for CeVD mortality1.03 (1.00–1.06); 0.07>1000; 14 studies1.01 (0.98–1.05)45.64%0.090.410.9581–1.1044Non-significant
Ambient temperature
Bunker et al.49
Moghadamnia et al.50
RR per 1°C change of temperature (heat) for CVD mortality1.04 (1.03–1.04); < 0.0001>1000; 62 studies1.013 (1.010–1.015)98.63%< 0.0001< 0.011.0225–1.0538Highly suggestive
Included reviewsaLevel of comparisonRandom-effects summary ES (95% CI); P valueSample size; N of included studiesES (95% CI) in the largest studyI2 (%)Egger’s test P valueExcess statistical significance test P value95% prediction intervalRobustness of evidence
Air pollution
Alexeeff et al.34
Chen et al. 2020
RR per 10 µg/m3 increase in PM2.5 for IHD mortality1.21 (1.10–1.33); < 0.0001>1000; 29 studies1.64 (1.62–1.66)98.16%0.360.210.7852–1.8617Highly suggestive
Yang et al.41
Chen et al. 2020
RR per 10 µg/m3 increase in PM2.5 for CVD mortality1.11 (1.09–1.14); < 0.0001>1000; 26 studies1.06 (1.04–1.08)74.23%0.080.371.0303–1.1959Highly suggestive
Stieb et al.40
Atkinson et al.35
HR per 10 ppb increase in NO2 for CeVD mortality1.03 (1.00–1.06); 0.07>1000; 14 studies1.01 (0.98–1.05)45.64%0.090.410.9581–1.1044Non-significant
Ambient temperature
Bunker et al.49
Moghadamnia et al.50
RR per 1°C change of temperature (heat) for CVD mortality1.04 (1.03–1.04); < 0.0001>1000; 62 studies1.013 (1.010–1.015)98.63%< 0.0001< 0.011.0225–1.0538Highly suggestive

RR, relative risk; HR, hazard ratio; CVD, cardiovascular disease; IHD, ischaemic heart disease; CeVD, cerebrovascular disease.

A bibliography of the abovementioned reviews is presented in Supplementary material online, Appendix S3.

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