Table 1 Summary of k-mean clustering

From: Gene-by-environment interactions in urban populations modulate risk phenotypes

Pollutant Low exposure High exposure
  Cluster mean by pollutants Number of individuals Cluster mean by pollutants Number of individuals
PM2.5 8.95 392 5.97 605
NO2 5.86 160 14.34 837
O3 22.97 775 25.05 222
SO2 0.72 339 1.90 658
  1. Cluster means and number of individuals within each categories