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Table 2 Description of personal 5-minute particle measurements from 191 study visits and 1 hour of ambient particle measurements and meteorology recorded between March 2007 and December 2008

From: Elevated particle number concentrations induce immediate changes in heart rate variability: a panel study in individuals with impaired glucose metabolism or diabetes

  N Mean ± SD Min 25% Median 75% Max IQR
Personal measurements of PNC (5-minute averages)
PNC [N/cm3] 11,872 20,822 ± 39,233 521 6,354 11,134 21,987 698,225 15,633
Ambient measurements at stationary monitoring site (1-hour averages)
UFP [N/cm3] 14,699 9,518 ± 6,902 937 4,892 7,629 12,049 80,858 7,157
ACP [N/cm3] 14,699 2,060 ± 1,535 88 1,020 1,657 2,615 17,377 1,595
PM10 [μg/m3] 15,466 18.3 ± 14.1 0.0 8.4 15.3 24.4 159.8 16.0
PM2.5 [μg/m3] 15,461 13.7 ± 11.2 0.0 5.8 10.9 18.1 106.5 12.3
Air temperature [°C] 15,398 10.8 ± 7.9 −8.4 4.7 10.8 16.5 33.8 11.8
Relative humidity [%] 15,398 76.9 ± 18.3 21.0 63.3 81.3 92.8 100.0 29.5
  1. SD: standard deviation, IQR: interquartile range, PNC: Particle number concentrations, PM10: particulate matter with an aerodynamic diameter <10 μm, PM2.5: particulate matter with an aerodynamic diameter <2.5 μm, ACP: accumulation mode particles (100–800 nm), UFP: ultrafine particles (10-100 nm).