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. Author manuscript; available in PMC: 2014 May 28.
Published in final edited form as: J Expo Sci Environ Epidemiol. 2008 Oct 8;19(5):525–533. doi: 10.1038/jes.2008.46

Table 5.

Regression coefficients of the changes in SDNN (ΔSDNN, in the unit of ms) and heart rate (ΔHR, in the unit of beat/ms) measured after the morning and afternoon shifts relative to increases in the average and peak PM2.5 mass concentration during the 1-h work shift [ln(ΔPM2.5), in the unit of μg/m3] (N=25).

ΔSDNN–ΔPM2.5
ΔHR–ΔPM
ln_ΔPM2.5 Estimate (SE) P-value Estimate (SE) P-value
Morning
 15 min ln_ΔPMave-m −14.5 (6.9) 0.06 1.2 (3.1) 0.71
 2 h ln_ΔPMave-m −18.9 (4.2) 0.0002 −5.5 (2.9) 0.08
 4 h ln_ΔPMave-m −2.5 (8.6) 0.78 −3.1 (4.6) 0.51
 15 min ln_ΔPMpeak-m −9.2 (11.2) 0.43 0.8 (4.4) 0.86
 2 h ln_ΔPMpeak-m −5.1 (13.8) 0.72 −7.2 (4.2) 0.11
 4 h ln_ΔPMpeak-m 7.4 (12.0) 0.55 −7.1 (6.3) 0.28
Afternoon
 15 min ln_ΔPMave-a −2.4 (7.6) 0.77 −2.0 (4.0) 0.62
 2 h ln_ΔPMave-a −20.2 (10.8) 0.10 0.9 (5.4) 0.87
 4 h ln_ΔPMave-a −0.7 (11.2) 0.95 8.2 (5.2) 0.14
 15 min ln_ΔPMpeak-a 0.6 (8.9) 0.95 −5.6 (5.3) 0.31
 2 h ln_ΔPMpeak-a −19.2 (14.6) 0.23 3.1 (8.1) 0.71
 4 h ln_ΔPMpeak-a −6.8 (14.1) 0.64 11.1 (8.1) 0.20