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. Author manuscript; available in PMC: 2022 Mar 3.
Published in final edited form as: Hypertension. 2021 Feb 1;77(3):813–822. doi: 10.1161/HYPERTENSIONAHA.120.15923

Table 2:

Analyses of the interaction between PM2.5 (treated as continuous, ordinal, and nominal), and study treatment for the incidence of the primary outcome

Treatment of PM2.5 Variable P Value for interaction between PM2.5 and Study Assignment
PM2.5 treated as continuous 0.047
PM2.5 Quintiles treated as continuous 0.01
PM2.5 Quintiles treated as nominal (all in one model)
 Overall 0.099
 Q2 vs Q1 0.27
 Q3 vs Q1 0.76
 Q4 vs Q1 0.066
 Q5 vs Q1 0.016
PM2.5 Quintiles treated as nominal (separate analyses)
 Q2 vs Q1 0.33
 Q3 vs Q1 0.81
 Q4 vs Q1 0.068
 Q5 vs Q1 0.017
 Q4–5 vs Q1–3 0.013