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Table 3 HRV parameters and inflammatory markers by time (Mean ± SD) a,b

From: Secondhand tobacco smoke exposure and heart rate variability and inflammation among non-smoking construction workers: a repeated measures study

HRV measures

Baseline

Post

p Valuec

Next morning

p Valued

Heart rate(bpm)

69.0(14.0)

71.6(12.5)

0.061

68.4(10.7)

0.916

SDNN(msec)

53.1(25.4)

47.9(20.1)

0.026

51.8(24.1)

0.149

rMSSD(msec)

28.6(17.9)

28.2(20.0)

0.429

28.5(19.3)

0.594

LF(msec2)

1164(1366)

961(1020)

0.039

1101(1309)

0.115

HF(msec2)

431(680)

518(996)

0.644

440(753)

0.754

CRP(mg/L)

1.89(2.03)

2.04(1.80)

0.371

2.53(2.40)

0.036

Lymphocytes(k/μl)

2.06(5.12)

2.16(5.61)

0.079

2.02(5.65)

0.451

Red blood cells(M/μl)

4.91(0.38)

4.83(0.33)

0.020

4.91(0.39)

0.746

White blood cells(k/μl)

6.80(1.57)

7.33(1.91)

0.010

7.14(2.35)

0.145

Neutrophils(k/μl)

3.96(1.23)

4.34(1.51)

0.031

4.33(1.98)

0.031

Monocytes(k/μl)

0.55(0.16)

0.59(0.18)

0.094

0.56(0.18)

0.761

Basophils(k/dl)

0.03(0.01)

0.03(0.01)

0.591

0.03(0.01)

0.577

Eosinophils(k/μl)

0.25(0.20)

0.24(0.23)

0.781

0.25(0.27)

0.424

Platelets(k/μl)

217(35)

222(36)

0.026

218(39)

0.577

  1. aExposure to SHS occurred from baseline to post.
  2. bUnadjusted Means(SDs).
  3. cComparison between baseline and post using linear mixed regression models for HRV parameters(N = 194), CRP(N = 100) and whole blood counts(N = 104) after adjusting for circadian variation, BMI and age.
  4. dComparison between baseline and next-morning using linear mixed regression models HRV parameters(N = 187), CRP(N = 94) and whole blood counts(N = 98) after adjusting for circadian variation, BMI and age.